/[clonezilla-sysresccd]/trunk/www/partitions.html
ViewVC logotype

Annotation of /trunk/www/partitions.html

Parent Directory Parent Directory | Revision Log Revision Log


Revision 164 - (hide annotations)
Sat Apr 9 21:34:35 2011 UTC (10 years, 6 months ago) by sng
File MIME type: text/html
File size: 50483 byte(s)
- updating profiles.conf for current original CDs
- updating cfg files for Clonezilla Live
- updating trunk site

1 sng 28 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
2     <html>
3     <head>
4     <link rel="alternate" type="application/rss+xml" title="RSS" href="http://clonezilla-sysresccd.hellug.gr/clonezilla-sysresccd.rss">
5     <link rel="shortcut icon" href="favicon.ico">
6     <title>Clonezilla-SysRescCD - Documentation: Managing partitions</title>
7     <style type="text/css">
8 sng 125 body { font-family: Arial, 'sans serif'; color: black; font-size: 12pt; background : fixed no-repeat; background-color: #333333; padding: 0; margin: 0; margin-top: 5px; margin-bottom: 5px; }
9 sng 28
10    
11    
12     #header {position:relative; display: block; width: 980px; height: 121px;margin: auto; padding: auto; background-color: #D37624; background-image: url('images/header.png');clear:both;}
13     #header h2{ color: #FFE6BC; font-weight: bold; font-size: 2.2em; margin:0; padding:0; padding-left: 10px; padding-top: 7px; text-shadow: #333333 2px 2px 4px;}
14     #header h3{ color: #FFE6BC; font-weight: bold; font-size: 1.8em; margin:0; padding: 0; padding-left: 10px; text-shadow: #333333 2px 2px 4px;}
15     #header h4{ color: #FFE6BC; font-weight: bold; font-size: 1.2em; margin:0; padding: 0; padding-left: 10px; padding-right: 10px; text-shadow: #333333 2px 2px 4px;}
16     #header a {text-decoration:none;}
17    
18     #contarea {display: block; width: 980px; margin: auto; padding: auto; background-color: #FFF2DD; clear:both;}
19    
20     #linkline { width: 980px; height: 29px;margin: auto; padding: auto; background-color: #D37624; background-image: url('images/linkline.png');clear:both; }
21     #linkline a{float: left; color: #FFE6BC; font-weight: bold; font-size: 0.8em; text-decoration: none; text-shadow: #333333 2px 2px 4px; padding-left: 10px; padding-right: 10px; padding-top: 5px;}
22     #linkline a:visited{color: #FFE6BC;}
23     #linkline a:hover{color: #333333;}
24     #linkline a.here {color: #333333; text-decoration: none;}
25    
26     #lastupdate {float: right; display: block; text-align: right; margin: 0; margin-top: -1.2em; padding: 0; padding-right: 15px;}
27    
28     #rss { float: right; text-align: right; padding-top: 3px;}
29    
30     #docline-top { float: right; padding-right: 40px; text-align: right; }
31     #docline-bottom { float: right; padding-right: 40px; text-align: right; font-size: 0.8em; padding-top: 15px; }
32     #docline-bottom a{ padding-left: 10px; padding-right: 10px; }
33    
34     #menu { float: right; display: block; width: 170px; margin: auto; padding: 15px; font-size: 0.8em; font-weight: bold; background-color: #FFE6BC;}
35     #menu h1 {color: #990000; font-size: 1.8em;text-shadow: gray 2px 2px 4px;}
36     #menu a,a:visited{ color: black; text-decoration: none; font-weight: normal;}
37     #menu a:hover{ text-decoration: underline;}
38     #menu p{ margin-bottom: 10px;}
39    
40     #content { float: left; display: block; width: 950px; margin: auto; padding: 15px;}
41    
42    
43     #footer {display: block; width: 980px; height: 100px;margin: auto; padding: auto; background-color: #D37624; background-image: url('images/footer.png');clear:both;text-shadow: #333333 2px 2px 4px;}
44     #footer p{color: #FFE6BC; font-weight: bold; padding:15px; padding-left: 10px;}
45     #footer a,a:visited{color: #FFE6BC; font-weight: bold; text-decoration:none;}
46     #footer a:hover{ color: #333333; text-decoration: none;}
47    
48    
49     #content H1,H2,H3,H4{color: #990000; text-align: left;}
50     #content H2{margin-top: 2em;}
51     #content H3{margin-top: 1.5em}
52     #content H4{margin-top: 1em}
53     #content li { margin-top: 1em;}
54     #content a,a:active,a:visited{text-decoration: none; color: #4075CA; font-weight: normal;}
55     #content a:hover{text-decoration: underline; font-weight: normal;}
56     #content .hidden{ display:none; }
57     #content p,td,table,tr,li { font-family: Arial, 'sans serif'; }
58     #content .nav{margin-left: 0pt;}
59     #content .newcode{font-family : "Courier New", Courier, monospace; font-weight: bold; background-color: #F2F2F2; border: solid 1px #DEDEDE;padding: 20pt;}
60     #content .note{margin-top: 30pt; margin-bottom: 30pt; text-align: left; background-color: #FFEFEF; border: double 3px; border-color: #FFD5D5;}
61     #content hr{color: Black; background-color: Black; height: 1px; border: none;}
62     #content .header-news{margin-top: 2em; margin-left: 25pt; font-weight: bold; color: #990000;}
63     #content .item-news{margin-left: 45pt; margin-right: 45pt;}
64     #content .otherpage{border: solid 1px darkgoldenrod; padding: 20pt; background-color: lemonchiffon;}
65     #content IMG {display: block; margin-left: auto; margin-right: auto; }
66     #content .red{color: white; background-color: Red; font-weight: bold;}
67     #lphp{text-align: right; padding-left: 10px; padding-right: 10px; padding-top: 50px; float: right;}
68     #lphp a{padding-left: 5px;}
69 sng 145 #warning { margin: 5px; padding: .4em; background-color: Red; color: White; align: center; font-weight: bold; border-width: 2px; border-color: white; border-style: solid; }
70 sng 144 #warning a { color: white; font-weight: bold; text-decoration: underline; }
71 sng 28 </style>
72 sng 144 <link href="warning.css" rel="stylesheet" type="text/css" />
73     <!--
74     The file waring.css exists only in the root of the site
75 sng 146 and it hides the UNSTABLE warnings. Its contents are
76 sng 144 #warning { display: none; }
77     -->
78 sng 28 <META NAME="Keywords" CONTENT="multiboot Multi Boot bootable cd rescue clonezilla sysresccd backup restore samba">
79     <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
80    
81     </head>
82    
83     <body>
84 sng 144 <div id="warning" align="center">
85     WARNING<br>
86 sng 146 This is the UNSTABLE version of Clonezilla-SysRescCD<br>
87 sng 149 To access our current stable version, please click <a href="../index.html">here</a>
88 sng 144 </div>
89 sng 28 <div id="header">
90 sng 124 <div id="lphp" style=""><a target="_blank" title="Display all in one long page" href="onepage.html"><img src="images/chain.png" border="0" /></a><a target="_blank" title="Display printable page" href="printable.php"><img src="images/print_it.png" border="0" /></a></div>
91 sng 28 <H2>Clonezilla-SysRescCD</H2>
92     <H3>Documentation: Managing partitions</H3>
93     <div style="margin:0; padding: 3px; width: 980; position relative;">
94 sng 141 <div style="position: absolute; left: 0px;"><H4>30/09/2010 - v 3.2.0</H4></div>
95 sng 164 <div style="position: absolute; right: 0px;"><H4>Last update: 09/04/2011</H4></div>
96 sng 28 </div>
97     </div>
98     <div id="linkline">
99     <a href="index.html">Home</a>
100     <a href="news.php">News</a>
101     <!-- <a href="features.html">Features</a>-->
102     <a class="here" href="doc.html">Documentation</a>
103 sng 95 <a href="download.html">Download</a>
104 sng 28 <a href="screenshots.html">Screenshots</a>
105     <a href="index.html#credits">Credits</a>
106     <a href="help.html">Help</a>
107    
108     <div id="rss">
109     <a href="clonezilla-sysresccd.rss"><img src="images/rss-orange-11.png" width="30" height="14" border="0"/></a>
110     </div>
111     <!-- docline-top-->
112     <div id="docline-top"> <a href="sysresccd.html">&lt; PREV</a> <a href="doc.html">UP</a> <a href="recover.html">NEXT &gt;</a> </div>
113     </div>
114     <div id="contarea">
115     <div id="content">
116     <a name="partitions-top"></a>
117    
118    
119     <!-- Intro -->
120    
121     <H2 style="margin-top: 0;"><a name="partitions-intro"></a>Intro <span class="hideprint">[<a href="#partitions-top" title="go to top of the page">^</a>]</span></H2>
122    
123     <p>One of the most important maintenance tasks that can only be done by using a live CD is partitioning. No operating system allows partitioning the same disk where the OS itself resides. Trying to do so is like attempting to repair a car while its engine is turned on.<br><br>
124     <!--empty line-->
125     Of course, <b>SystemRescueCD</b> contains multiple programs that are related to partitioning. Most important are <b>GParted</b> (graphical partitioning program), <b>GNU Parted</b> (text-based partitioning program), <b>fdisk</b> and <b>sfdisk</b> (partition table editors) and various filesystem tools (like <b>ntfsprogs</b> and <b>e2fsprogs</b>).<br><br>
126     <!--empty line-->
127     This page contains some theory about partitions and filesystems, advice for choosing the right filesystem and a partitioning example by using <b>GParted</b>.</p>
128    
129     <div align="center"><table class="note" border="0" cellpadding="20"><tr><td valign="top"><img src="images/important.png"></td><td>
130     While partitioning, an user error or a bug can damage your partitions.<br><br>Creating a disk image of the disk to be<br>partitioned beforehand is highly recommended.
131     </td></tr></table></div>
132     <div align="center"><table class="note" border="0" cellpadding="20"><tr><td valign="top"><img src="images/info.png"></td><td>
133 sng 110 The following pressentation has been made using<br><b>SystemRescueCD v 1.5.8</b>
134 sng 28 </td></tr></table></div>
135    
136     <H2><a name="theory"></a>Some theory <span class="hideprint">[<a href="#partitions-top" title="go to top of the page">^</a>]</span></H2>
137    
138     <H3><a name="partitions-partition"></a>What is a partition? <span class="hideprint">[<a href="#partitions-top" title="go to top of the page">^</a>]</span></H3>
139    
140     <p>A partition is a logical division of a hard disk created so that you can have different operating systems on the same hard disk or to create the appearance of having separate hard drives for file management, multiple users, or other purposes.</p>
141    
142     <p>In Windows, a one-partition hard disk is labelled the "C:" drive ("A:" and "B:" are typically reserved for diskette drives). A two-partition hard drive would typically contain "C:" and "D:" drives. (CD-ROM drives typically are assigned the last letter in whatever sequence of letters have been used as a result of hard disk formatting, or typically with a two-partition, the "E:" drive.).</p>
143    
144     <p>In UNIX-based systems, a partition is used to host the / (root) file system, and optionally the /opt, /usr and /home file systems. There may also be a swap partition, which doesn't host any file system.</p>
145    
146     <p>Each operatin system provides some kind of tool to create and manage partitions. Examples of such tools are <b>fdisk</b> in DOS/Windows, <b>fdisk</b>, <b>sfdisk</b> and <b>parted</b> in Linux, etc.</p>
147    
148 sng 85 <H3><a name="partitions-extended"></a>What is the difference between primary, extended and logical partitions? <span class="hideprint">[<a href="#partitions-top" title="go to top of the page">^</a>]</span></H3>
149 sng 28
150 sng 159 <p>Information about partitions is saved in so-called partition table in Master Boot Record. MBR itself is only 512 bytes in size, and only 64 bytes are reserved for partition table. That's not enough, and there are many workarounds to bypass limitations caused by the size, for example <a href="http://en.wikipedia.org/wiki/Logical_block_addressing#Enhanced_BIOS" target="_blank">logical block addressing</a>. Extended partitions are another workaround.</p>
151 sng 28
152     <p>Partition table can only store information about four partitions. If one has, for example, two GNU/Linux distributions on the same disk, both of them having separate root partitions, shared /home and shared swap, the partition number limit has been hit already.</p>
153    
154     <p>A partition that is mentioned in the partition table is called primary partition. Because of the limit, one disk can only contain 1-4 primary partitions.</p>
155    
156     <p>An extended partition fixes the problem simply by containing more boot records, called Extended Boot Records (EBR). Each EBR contains information about one logical partition and, if the extended partition contains multiple logical partitions, link to the next EBR. Thus, an extended partition can contain unlimited amount of logical partitions.</p>
157    
158     <p>Extended partition contains only EBRs and logical partitions (and maybe unallocated space). Extended partition doesn't contain any filesystem and files can't be stored in it. Of course, logical partition can contain any filesystem (or be unformatted).</p>
159    
160 sng 85 <p>Logical partitions can always be used for storing data: any operating system can see logical partitions. GNU/Linux supports both multiple primary extended partitions and extended partitions within each other, while Windows supports only the latter. GNU/Linux distributions can be installed to logical partitions as well, but Windows requires a lot of tweaking. See <a href="http://www.goodells.net/multiboot/index.htm" target="_blank">this outdated guide</a>.</p>
161 sng 28
162     <H3><a name="partitions-lvm"></a>What is LVM? <span class="hideprint">[<a href="#partitions-top" title="go to top of the page">^</a>]</span></H3>
163    
164     <p>LVM means "Logical Volume Manager". It allows creating volume groups on top of hard drives and logical volumes within volume groups. Logical volumes are NOT the same thing as logical partitions!</p>
165    
166     <p>Volume groups can be created very flexibly: a volume group can allocate, for example, the first half of the first hard drive and the second half of the third drive. One can even create a massive volume group containing all storage he/she has.</p>
167    
168     <p>The computer sees a logical volume as a partition: logical volume can be left unformatted or contain any filesystem.</p>
169    
170     <p>LVM has many benefits: for example, if one has three hard drives 60 gigabytes each, he/she can create a 160-gigabyte partition for storing massive files and/or saving some disk space. In addition, logical volumes can be resized even when they're in use, so when creating logical volumes one doesn't need to worry if they're too small or big - if they are, he/she can resize them at any time.</p>
171    
172     <p>However, resizing a logical volume doesn't resize the filesystem in it, so using a filesystem that can be resized in use (online resizing) is recommended. Very few filesystems can be shrinked online, but most GNU/Linux filesystems (including ext3/4, ReiserFS, XFS and btrfs) can be grown online. It's generally a good idea to leave unallocated space within volume group, so logical volumes can later be grown without shrinking any other logical volume.</p>
173    
174     <p>Here come bad news for people who dualboot: Windows doesn't support LVM, it sees volume groups as unformatted partitions. If you try to access volume group within Windows, you're just prompted to format the partition. That prompt is annoying at best and dangerous at worst.</p>
175    
176     <p>More information about LVM can be found <a href="http://sunoano.name/ws/public_xhtml/lvm.html" target="_blank">here</a> (almost everything about LVM in a single page) and <a href="http://www.sysresccd.org/Sysresccd-Guide-EN-LVM2" target="_blank">here</a> (official SystemRescueCD documentation about LVM).</p>
177    
178     <H3><a name="partitions-filesystem"></a>What is a file system? <span class="hideprint">[<a href="#partitions-top" title="go to top of the page">^</a>]</span></H3>
179    
180     <p>A file system is the way in which files are named and where they are placed logically for storage and retrieval. The DOS, Windows, OS/2, Macintosh, and UNIX-based operating systems all have file systems in which files are placed somewhere in a hierarchical (tree) structure. A file is placed in a directory (folder in Windows) or subdirectory at the desired place in the tree structure.</p>
181    
182     <p>The most important difference between filesystems is operating system support. Some filesystems are supported by all modern operating systems, but especially the newest filesystems are very rarely supported. Other important limits are maximum file size, journaling support and file permission metadata support.</p>
183    
184     <p>The reason that file size limits exist is that all filesystems reserve a fixed number of bits for storing the file size. If the size of the file, in bytes, is bigger than the biggest number that can be stored in file size bits, the operating system must refuse to store the file at all in order to prevent data corruption.</p>
185    
186     <p>File permission metadata means that the filesystem stores in the metadata of the file, among other things, information about who owns the file and what different users are allowed to do with the file. That metadata is especially useful in multi-user environment because it mostly prevents users from reading each other's files. Permissions can be bypassed, however.</p>
187    
188     <H3><a name="partitions-journaling"></a>What is journaling? <span class="hideprint">[<a href="#partitions-top" title="go to top of the page">^</a>]</span></H3>
189    
190     <p>Ideally, data in a partition never corrupts. But, in the real world, there are power failures and operating system freezes. And if a computer is forcefully shut down while something is written to the drive, the write operation can't be finished. That can damage the filesystem and destroy any files in the partition.</p>
191    
192     <p>Journaling partially fixes that problem by writing most changes to the disk twice: first to a special area called journal and, after that, to the filesystem itself. If power is lost while writing to the journal was in progress, the partial change is just ignored and never committed to the filesystem itself. If power failure or OS freeze happened while writing to filesystem itself, the write operation is finished by using the information in journal.</p>
193    
194 sng 85 <p>Journaling is always a trade-off between reliability and performance. In fact, the ext3 and ext4 filesystems support multiple journaling modes in order to allow the user to choose the optimal compromise. The most popular choices are <b>ordered</b> and <b>writeback</b>.</p>
195 sng 28
196 sng 85 <p>Both modes only write metadata changes to the journal before committing them: data itself is written directly to the main filesystem. The difference between the modes is that <b>ordered</b> mode guarantees that the data is written before the change is marked as committed. The difference may sound small, but in some cases <b>ordered</b> mode causes horrible performance. In Linux 2.6.30, the default journaling mode was changed to <b>writeback</b> - and it was quickly found out that <b>writeback</b> mode may cause massive data loss. See <a href="http://forums.raiden.net/viewtopic.php?p=155912#155912" target="_blank">this forum post</a> for details. Most GNU/Linux distributions are now using <b>ordered</b> mode as the default again.</p>
197 sng 28
198 sng 85 <p>In addition, on SSDs (Solid State Drives) and thumb drives write speed is much slower than read speed. They also have a limited number of writing cycles, so journaling reduces their lifetime. Thus, I (Jyrki) recommend against using journaling fileystems on such drives.</p>
199    
200 sng 28 <H3><a name="partitions-filesystems"></a>What are the differences between most popular filesystems? <span class="hideprint">[<a href="#partitions-top" title="go to top of the page">^</a>]</span></H3>
201    
202     <p>The following table quickly describes the most important differences between them.</p>
203     <!--not-on-txt-->
204     <table border="1">
205     <tr>
206     <th></th>
207     <th colspan="2">Operating system support</th>
208     <th></th>
209     <th></th>
210     <th></th>
211     </tr>
212     <tr>
213     <th></th>
214     <th>Under Windows</th>
215     <th>Under GNU/Linux</th>
216     <th>Maximum file size</th>
217     <th>Journaling</th>
218     <th>Permissions</th>
219     </tr>
220     <tr>
221     <th>FAT32</th>
222     <td style="background-color: rgb(0,255,0)">Native</td>
223     <td style="background-color: rgb(127,255,0)">Built-in</td>
224     <td style="background-color: rgb(255,0,0)">4 GB</td>
225     <td style="background-color: rgb(255,0,0)">No</td>
226     <td style="background-color: rgb(255,0,0)">No</td>
227     </tr>
228     <tr>
229     <th>NTFS</th>
230     <td style="background-color: rgb(0,255,0)">Native</td>
231     <td style="background-color: rgb(255,255,0)">Driver included</td>
232     <td style="background-color: rgb(255,255,0)">16 EB</td>
233     <td style="background-color: rgb(0,255,0)">Yes</td>
234     <td style="background-color: rgb(0,255,0)">Yes</td>
235     </tr>
236     <tr>
237     <th>ext2</th>
238     <td style="background-color: rgb(255,127,0)">3rd party driver</td>
239     <td style="background-color: rgb(0,255,0)">Native</td>
240     <td style="background-color: rgb(255,127,0)">16 GB-2 TB*</td>
241     <td style="background-color: rgb(255,0,0)">No</td>
242     <td style="background-color: rgb(0,255,0)">Yes</td>
243     </tr>
244     <tr>
245     <th>ext3</th>
246     <td style="background-color: rgb(255,127,0)">3rd party driver</td>
247     <td style="background-color: rgb(0,255,0)">Native</td>
248     <td style="background-color: rgb(255,127,0)">16 GB-2 TB*</td>
249     <td style="background-color: rgb(0,255,0)">Yes</td>
250     <td style="background-color: rgb(0,255,0)">Yes</td>
251     </tr>
252     <tr>
253     <th>ext4</th>
254 sng 159 <td style="background-color: rgb(255,127,0)">3rd party driver</td>
255 sng 28 <td style="background-color: rgb(0,255,0)">Native</td>
256     <td style="background-color: rgb(255,127,0)">16 GB-16 TB*</td>
257     <td style="background-color: rgb(0,255,0)">Yes</td>
258     <td style="background-color: rgb(0,255,0)">Yes</td>
259     </tr>
260     <tr>
261     <th>exFAT</th>
262 sng 85 <td style="background-color: rgb(127,255,0)">Built-in (Vista/7)**</td>
263     <td style="background-color: rgb(255,127,0)">3rd party driver</td>
264 sng 28 <td style="background-color: rgb(0,255,0)">64 ZB</td>
265     <td style="background-color: rgb(255,0,0)">No</td>
266     <td style="background-color: rgb(0,255,0)">Yes</td>
267     </tr>
268     </table>
269     <!--end-not-on-txt-->
270    
271    
272    
273     <p>* Depends on cluster size<br>
274 sng 159 ** <a href="http://support.microsoft.com/kb/955704" target="_blank">This update</a> adds exFAT support to Windows XP</p>
275 sng 28
276     <p>Operating system support:</p>
277    
278     <ul>
279     <li>"Native" means that the kernel supports the filesystem and the OS can boot from a partition using that FS.</li>
280     <li>"Built-in" means that the kernel supports the filesystem, but booting from a partition containing such FS is very difficult.</li>
281     <li>"Driver included" means that ntfs-3g (the driver that adds NTFS support to Linux) comes with most GNU/Linux distributions.</li>
282 sng 159 <li>"3rd party driver" means that a driver to add filesystem support is available, but must be downloaded and installed separately. The ext2/3/4 driver is <a href="http://www.ext2fsd.com" target="_blank">Ext2fsd</a> and the exFAT driver is <a href="http://code.google.com/p/exfat/" target="_blank">exfat</a>.</li>
283 sng 28 </ul>
284    
285     <H2><a name="filesystems"></a>Filesystems <span class="hideprint">[<a href="#partitions-top" title="go to top of the page">^</a>]</span></H2>
286    
287     <p>This section contains more information about most popular filesystems.</p>
288    
289     <H3><a name="partitions-fat32"></a>FAT32 <span class="hideprint">[<a href="#partitions-top" title="go to top of the page">^</a>]</span></H3>
290    
291     <p>The initial version of FAT (File Allocation Table), now referred as FAT12, was designed for floppy disks. A FAT12 partition can only be up to 32 megabytes in size. After that, PCs equipped with hard drives were introcuded by IBM and the sizes of hard drives began growing. Microsoft answered the need by developing first initial FAT16 and then final FAT16.</p>
292    
293     <p>FAT16 partition can be up to two gigabytes in size. In the middle of 1990s, that limit was becoming a problem. Microsoft pushed the limit up by updating FAT again.</p>
294    
295     <p>FAT32 was first introduced with Windows 95 OSR2. Windows 98, Windows Me, Windows 2000 and newer support FAT32 too. Linux kernel has supported FAT32 almost as long as Windows, but booting GNU/Linux from FAT32 partition is difficult and actually requires DOS to be installed in the partition as well. (<a href="http://en.wikipedia.org/wiki/FAT_filesystem_and_Linux#Installing_Linux_on_and_booting_it_from_FAT_volumes_using_umsdos" target="_blank">more information</a>)</p>
296    
297 sng 159 <p>FAT32 partition can be up to two terabytes in size. There are already hard drives that exceed the limit. A single file within FAT32 partition can be up to four gigabytes in size.</p>
298 sng 28
299     <p>Because FAT32 is, in the end, based on FAT12, it has very few features. It doesn't support file permissions, hard/symbolic links, encryption, compression, alternative data streams, journaling... It lacks support for nearly anything that defines a modern filesystem. However, due to very few features, FAT32 is very fast filesystem if it's not fragmented or on a Flash-based drive. Mind you, FAT32 fragments very fast.</p>
300    
301     <p>Due to excellent operating system support, I recommend FAT32 for storing files which should be accessible in both Windows and GNU/Linux. FAT32 is also a good filesystem on Solid State Drives and thumb drives due to its performance.</p>
302    
303     <H3><a name="partitions-ext2"></a>ext2 <span class="hideprint">[<a href="#partitions-top" title="go to top of the page">^</a>]</span></H3>
304    
305     <p>Ext2 or ext2fs is the successor of extfs (extended file system). Extfs didn't support separated timestamps for access, data modification and inode modification. In order to add support for them, and make the filesystem extendable, a new filesystem had to be created.</p>
306    
307     <p>Ext2 was developed in January 1993, earlier than any other filesystem mentioned in this page.</p>
308    
309 sng 159 <p>Because ext2 is designed for GNU/Linux, support in Linux kernel was implemented immediately. The first Windows driver supporting ext2, <a href="http://www.ext2fsd.com" target="_blank">Ext2fsd</a> 0.01, was released on 25 January 2002. Ext2fsd works only on Windows NT operating systems starting from Windows 2000.</p>
310 sng 28
311     <p>The best property of ext2 is extensibility. The superblock contains information about which version the filesystem is (ext2, ext3 or ext4) and which extensions and features are in use. By using these pieces of information, the operating system or driver can decide whether or not mounting the partition is safe. That's the most important reason why most GNU/Linux distributions still use successors of ext2 as default filesystems.</p>
312    
313     <p>Depending on cluster size, ext2 partition can be up to 2-32 terabytes in size. File size limit is 16 GB-2 TB.</p>
314    
315     <p>Ext2 supports file permissions, both hard and symbolic links and extended file attributes. Encryption, compression and journaling are unsupported.</p>
316    
317 sng 159 <p>Lack of journaling support is the worst limitation of ext2. What was done in order to get rid of the limitation?</p>
318 sng 28
319     <H3><a name="partitions-ext3"></a>ext3 <span class="hideprint">[<a href="#partitions-top" title="go to top of the page">^</a>]</span></H3>
320    
321 sng 85 <p>Ext3, the successor of ext2, was introduced in Linux kernel on November 2001. It supports journaling, can be grown online and optionally indexes large directories.</p>
322 sng 28
323 sng 159 <p>Ext2fsd can mount ext3 partition as ext2. Thus, ext3 support under Windows is just as good/bad as ext2 support.</p>
324 sng 28
325     <p>Partition and file size limits are the same as in ext2: partition size limit is 2-32 TB and file size limit 16 GB-2 TB, depending on cluster size.</p>
326    
327 sng 159 <p>Ext3 is becoming obsolete because there is...</p>
328 sng 28
329     <H3><a name="partitions-ext4"></a>ext4 <span class="hideprint">[<a href="#partitions-top" title="go to top of the page">^</a>]</span></H3>
330    
331     <p>Linux kernel support for ext4, the successor of ext3, was marked stable code on October 2008. Ext4 contains multiple performance and stability improvements over ext3.</p>
332    
333     <p>The most important new feature is extents. An extent is a contiguous area of storage that has been reserved for a file. When a process starts to write to a file, the whole extent is allocated even before the write operation begins. The idea is that even if the file is larger than expected, it doesn't fragment if it doesn't exceed the size of the extent.</p>
334    
335     <p>Another important improvement is larger partition size limit: an ext4 partition can be even one exabyte in size. (An exabyte is a million terabytes.) In addition, a directory within an ext4 partition can contain up to 64 000 subdirectories (instead of 32 000, as in ext2/3) and timestamps are much more accurate. The file size limit is 16 GB-16 TB, depending on cluster size.</p>
336    
337 sng 159 <p>Ext2fsd 0.50, released on 5 February 2011, supports ext4 and is able to mount ext4 partition even if extents are enabled. Thus, ext4 support under Windows is just as good/bad as ext2 support.</p>
338 sng 28
339 sng 159 <p>Due to availability of Ext2fsd 0.50 and additional features, ext4 has become the de-facto GNU/Linux filesystem. Because journaling can be disabled, it is suitable for Solid State Drives and thumb drives too.</p>
340 sng 28
341     <H3><a name="partitions-ntfs"></a>NTFS <span class="hideprint">[<a href="#partitions-top" title="go to top of the page">^</a>]</span></H3>
342    
343     <p>At the end of 1980s, IBM and Microsoft were developing OS/2 operating system. Both companies expected OS/2 1.1, released on 1988, to be the first popular operating system having a GUI, Presentation Manager. Even though it didn't become too popular during its first years, Microsoft didn't complain: Windows 2 didn't sell any better.</p>
344    
345     <p>But on May 1990, Microsoft released Windows 3.0. Millions of copies of it were sold during its first year, and Microsoft began to believe that OS/2 had failed due to decisions of IBM. At autumn 1990, Microsoft stopped cooperating with IBM, recasted OS/2 3.0 as Windows NT and continued developing it alone, leaving IBM alone with OS/2.</p>
346    
347     <p>Windows NT was targeted for network file servers, and there were already competition, most importantly Novell NetWare and OS/2. Among other things, the filesystem of Windows NT had to be fast, space efficient and reliable.</p>
348    
349     <p>NTFS (New Technology File System) was introcuded with Windows NT 3.1. Newer versions of NTFS have been introduced with newer versions of Windows NT, and the filesystem is most likely still under development. All versions of Windows NT support NTFS, but support in Linux kernel was implemented as late as on December 2003.</p>
350    
351     <p>NTFS is still, in my opinion, the most feature-filled filesystem around. It supports file permissions, both hard and symbolic links, encryption, compression, alternative data streams, journaling... There are very few features NTFS doesn't support.</p>
352    
353     <p>Depending on cluster size, a NTFS partition can be up to 8 ZB-1 YB in size. (A zettabyte (ZB) is a milliard terabytes and a yottabyte (YB) a billion terabytes.) File size limit is 16 EB.</p>
354    
355     <p>Windows 7 can only be installed on a NTFS partition, and Vista requires a <a href="http://www.computersplace.com/install-windows-vista-on-a-fat32-partition/windows-vista" target="_blank">work-around</a> if one wants to install it on a FAT32 partition. Of course NTFS partitions can be used for data storage as well: due to features of NTFS, I recommend doing so on mechanical hard drives on Windows-only computers.</p>
356    
357     <H3><a name="partitions-exfat"></a>exFAT <span class="hideprint">[<a href="#partitions-top" title="go to top of the page">^</a>]</span></H3>
358    
359     <p>NTFS is a great filesystem, but due to its complexity and journaling, it's not suitable for Flash-based drives. Even Microsoft itself has recommended using FAT32 on removable Flash media.</p>
360    
361     <p>However, FAT32 only allows files up to four gigabytes in size. The limit is already becoming too small, for example a DVD disc image can exceed that limit. In addition, FAT32 lacks file permission support. In order to get rid of these limitations, Microsoft took FAT from its grave and updated it one more time.</p>
362    
363 sng 85 <p>ExFAT (extended FAT), also known as FAT64, was introduced with Windows CE 6.0, on November 2006. Windows Vista SP1, Windows 7 and newer support exFAT too, and by installing <a href="http://support.microsoft.com/kb/955704" target="_blank">this update</a> Windows XP can be extended to support exFAT as well. GNU/Linux drivers are available too, but currently none of them are both stable and free. The best option seems to be <a href="http://code.google.com/p/exfat/" target="_blank">exfat</a>, an open-source driver in beta stage.</p>
364 sng 28
365     <p>The partition and file size limits of exFAT are the same: 64 zettabytes. Another important improvement is file permission support that, oddly, is lacking in Windows Vista. In addition, a directory within an exFAT partition can contain up to 2 796 202 files (instead of 65 536, as in FAT32) and timestamps have become more accurate.</p>
366    
367     <p>No operating system can be installed to an exFAT partition, so such partitions can only be used for data storage. Due to lack of journaling and support for huge files, exFAT is a good filesystem on Solid State Drives and thumb drives that are only used within Windows Vista and/or 7.</p>
368    
369    
370    
371     <H3><a name="annex-b-list"></a>Partition list <span class="hideprint">[<a href="#annex-b-top" title="go to top of the page">^</a>]</span></H3>
372    
373     <p>The following table presents known partition types along with their IDs:</p>
374    
375     <p class="newcode" style="margin-right: 0;">&nbsp;0&nbsp;&nbsp;Empty&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;80&nbsp;&nbsp;Old&nbsp;Minix<br>
376     &nbsp;1&nbsp;&nbsp;FAT12&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;81&nbsp;&nbsp;Minix&nbsp;/&nbsp;old&nbsp;Linux<br>
377 sng 85 &nbsp;2&nbsp;&nbsp;XENIX&nbsp;root&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<font color="Green">82&nbsp;&nbsp;Linux&nbsp;swap&nbsp;/&nbsp;Solaris</font><br>
378     &nbsp;3&nbsp;&nbsp;XENIX&nbsp;usr&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<font color="Red">83&nbsp;&nbsp;Linux</font><br>
379 sng 28 &nbsp;4&nbsp;&nbsp;FAT16&nbsp;&lt;32M&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;84&nbsp;&nbsp;OS/2&nbsp;hidden&nbsp;C:&nbsp;drive<br>
380 sng 85 &nbsp;<font color="Red">5&nbsp;&nbsp;Extended</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;85&nbsp;&nbsp;Linux&nbsp;extended<br>
381     &nbsp;6&nbsp;&nbsp;FAT16&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;86&nbsp;&nbsp;NTFS&nbsp;volume&nbsp;set<br>
382 sng 28 &nbsp;<font color="Green">7&nbsp;&nbsp;HPFS/NTFS</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;87&nbsp;&nbsp;NTFS&nbsp;volume&nbsp;set<br>
383     &nbsp;8&nbsp;&nbsp;AIX&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;88&nbsp;&nbsp;Linux&nbsp;plaintext<br>
384     &nbsp;9&nbsp;&nbsp;AIX&nbsp;bootable&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8e&nbsp;&nbsp;Linux&nbsp;LVM<br>
385     &nbsp;a&nbsp;&nbsp;OS/2&nbsp;Boot&nbsp;Manager&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;93&nbsp;&nbsp;Amoeba<br>
386     &nbsp;b&nbsp;&nbsp;W95&nbsp;FAT32&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;94&nbsp;&nbsp;Amoeba&nbsp;BBT<br>
387     &nbsp;<font color="Red">c&nbsp;&nbsp;W95&nbsp;FAT32&nbsp;(LBA)</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;9f&nbsp;&nbsp;BSD/OS<br>
388     &nbsp;e&nbsp;&nbsp;W95&nbsp;FAT16&nbsp;(LBA)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;a0&nbsp;&nbsp;IBM&nbsp;Thinkpad&nbsp;hibernation<br>
389     &nbsp;<font color="Green">f&nbsp;&nbsp;W95&nbsp;Ext'd&nbsp;(LBA)</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;a5&nbsp;&nbsp;FreeBSD<br>
390     10&nbsp;&nbsp;OPUS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;a6&nbsp;&nbsp;OpenBSD<br>
391     11&nbsp;&nbsp;Hidden&nbsp;FAT12&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;a7&nbsp;&nbsp;NeXTSTEP<br>
392     12&nbsp;&nbsp;Compaq&nbsp;diagnostics&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;a8&nbsp;&nbsp;Darwin&nbsp;UFS<br>
393     14&nbsp;&nbsp;Hidden&nbsp;FAT16&nbsp;&lt;32M&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;a9&nbsp;&nbsp;NetBSD<br>
394     16&nbsp;&nbsp;Hidden&nbsp;FAT16&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ab&nbsp;&nbsp;Darwin&nbsp;boot<br>
395     17&nbsp;&nbsp;Hidden&nbsp;HPFS/NTFS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;b7&nbsp;&nbsp;BSDI&nbsp;fs<br>
396     18&nbsp;&nbsp;AST&nbsp;SmartSleep&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;b8&nbsp;&nbsp;BSDI&nbsp;swap<br>
397     1b&nbsp;&nbsp;Hidden&nbsp;W95&nbsp;FAT32&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;bb&nbsp;&nbsp;Boot&nbsp;Wizard&nbsp;hidden<br>
398     1c&nbsp;&nbsp;Hidden&nbsp;W95&nbsp;FAT32&nbsp;(LBA)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;be&nbsp;&nbsp;Solaris&nbsp;boot<br>
399     1e&nbsp;&nbsp;Hidden&nbsp;W95&nbsp;FAT16&nbsp;(LBA)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;bf&nbsp;&nbsp;Solaris<br>
400     24&nbsp;&nbsp;NEC&nbsp;DOS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;c1&nbsp;&nbsp;DRDOS/sec&nbsp;(FAT-12)<br>
401     39&nbsp;&nbsp;Plan&nbsp;9&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;c4&nbsp;&nbsp;DRDOS/sec&nbsp;(FAT-16&nbsp;<&nbsp;32M)<br>
402     3c&nbsp;&nbsp;PartitionMagic&nbsp;recovery&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;c6&nbsp;&nbsp;DRDOS/sec&nbsp;(FAT-16)<br>
403     40&nbsp;&nbsp;Venix&nbsp;80286&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;c7&nbsp;&nbsp;Syrinx<br>
404     41&nbsp;&nbsp;PPC&nbsp;PReP&nbsp;Boot&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;da&nbsp;&nbsp;Non-FS&nbsp;data<br>
405     42&nbsp;&nbsp;SFS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;db&nbsp;&nbsp;CP/M&nbsp;/&nbsp;CTOS&nbsp;/&nbsp;...<br>
406     4d&nbsp;&nbsp;QNX4.x&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;de&nbsp;&nbsp;Dell&nbsp;Utility<br>
407     4e&nbsp;&nbsp;QNX4.x&nbsp;2nd&nbsp;part&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;df&nbsp;&nbsp;BootIt<br>
408     4f&nbsp;&nbsp;QNX4.x&nbsp;3rd&nbsp;part&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;e1&nbsp;&nbsp;DOS&nbsp;access<br>
409     50&nbsp;&nbsp;OnTrack&nbsp;DM&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;e3&nbsp;&nbsp;DOS&nbsp;R/O<br>
410     51&nbsp;&nbsp;OnTrack&nbsp;DM6&nbsp;Aux1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;e4&nbsp;&nbsp;SpeedStor<br>
411     52&nbsp;&nbsp;CP/M&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;eb&nbsp;&nbsp;BeOS&nbsp;fs<br>
412     53&nbsp;&nbsp;OnTrack&nbsp;DM6&nbsp;Aux3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ee&nbsp;&nbsp;EFI&nbsp;GPT<br>
413     54&nbsp;&nbsp;OnTrackDM6&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ef&nbsp;&nbsp;EFI&nbsp;(FAT-12/16/32)<br>
414     55&nbsp;&nbsp;EZ-Drive&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;f0&nbsp;&nbsp;Linux/PA-RISC&nbsp;boot<br>
415     56&nbsp;&nbsp;Golden&nbsp;Bow&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;f1&nbsp;&nbsp;SpeedStor<br>
416     5c&nbsp;&nbsp;Priam&nbsp;Edisk&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;f4&nbsp;&nbsp;SpeedStor<br>
417     61&nbsp;&nbsp;SpeedStor&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;f2&nbsp;&nbsp;DOS&nbsp;secondary<br>
418     63&nbsp;&nbsp;GNU&nbsp;HURD&nbsp;or&nbsp;SysV&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;fd&nbsp;&nbsp;Linux&nbsp;raid&nbsp;autodetect<br>
419     64&nbsp;&nbsp;Novell&nbsp;Netware&nbsp;286&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;fe&nbsp;&nbsp;LANstep<br>
420     65&nbsp;&nbsp;Novell&nbsp;Netware&nbsp;386&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ff&nbsp;&nbsp;BBT<br>
421     70&nbsp;&nbsp;DiskSecure&nbsp;Multi-Boot<br>
422     75&nbsp;&nbsp;PC/IX</p>
423    
424     <p>The partitions you are most likely to see in use, are:</p>
425    
426     <ul>
427     <li><b><font color="Green">HPFS/NTFS (ID = 7)</font></b><br>
428     This is the <b>Windows XP</b> partition, also known as <b>NTFS</b></li>
429    
430     <li><b><font color="Red">W95 FAT32 (LBA) (ID = c)</font></b><br>
431     This is the <b>Windows 95 - 98</b> partition<br>
432     It is used in any kind of disk and large USB devices (1 GB and more)</li>
433    
434     <li><b><font color="Green">W95 Ext'd (LBA) (ID = f)</font></b><br>
435 sng 85 Extended partition. It acts as a container for other partitions</li>
436 sng 28
437 sng 85 <li><b><font color="Red">Extended (ID = 5)</font></b><br>
438     Another extended partition type. It acts as a container for other partitions<br>
439     There is one more extended partition type (ID = 85), but Windows doesn't recognise it</li>
440    
441     <li><b><font color="Green">Linux swap / Solaris (ID = 82)</font></b><br>
442 sng 28 Swap partition, acting as <b>Virtual Memory</b><br>
443     Modern computers with 1 - 2 GB of memory may not use it at all</li>
444    
445 sng 85 <li><b><font color="Red">Linux (ID = 83)</font></b><br>
446 sng 28 Linux partitions, such as <b>ext2</b>, <b>ext3</b> and <b>reiserfs</b></li>
447     </ul>
448    
449    
450    
451    
452    
453    
454    
455     <H2><a name="example"></a>Partitioning example <span class="hideprint">[<a href="#partitions-top" title="go to top of the page">^</a>]</span></H2>
456    
457     <p>This section contains a partitioning example. I simulate the following situation in a virtual machine:</p>
458    
459 sng 159 <p>I have two partitions in my disk: <b>/dev/sda1</b> that contains a GNU/Linux distribution, and <b>/dev/sda2</b> that is a swap partition. Here we can see the output of <b>parted</b>:</p>
460 sng 28
461 sng 159 <p class="newcode">root@sysresccd /root % parted -l<br>
462     Model: ATA VBOX HARDDISK (scsi)<br>
463     Disk /dev/sda: 2097MB<br>
464     Sector size (logical/physical): 512B/512B<br>
465     Partition Table: msdos<br>
466 sng 28 <br>
467 sng 159 Number&nbsp;&nbsp;Start&nbsp;&nbsp;&nbsp;End&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Size&nbsp;&nbsp;&nbsp;&nbsp;Type&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;File&nbsp;system&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Flags<br>
468     &nbsp;1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;32.3kB&nbsp;&nbsp;1679MB&nbsp;&nbsp;1679MB&nbsp;&nbsp;primary&nbsp;&nbsp;ext4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;boot<br>
469     &nbsp;2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1679MB&nbsp;&nbsp;2097MB&nbsp;&nbsp;418MB&nbsp;&nbsp;&nbsp;primary&nbsp;&nbsp;linux-swap(v1)<br>
470 sng 28 <br>
471 sng 159 <br>
472     Warning: Unable to open /dev/sr0 read-write (Read-only file system).&nbsp;&nbsp;/dev/sr0 has been opened read-only.<br>
473     Error: /dev/sr0: unrecognised disk label<br>
474     <br>
475     Error: /dev/fd0: unrecognised disk label</p>
476 sng 28
477     <p>Now I'm going to install another distribution on the same disk. First of all, I need one more partition, because only one distro can be installed on one partition. In addition, I want to separate /home to its own partition in order to be able to share it between distributions.</p>
478    
479     <p>Because the whole disk is already allocated, I must shrink at least one existing partition in order to create new partitions. I'll shrink both of them to half (<b>/dev/sda1</b> from 1,6 gigabytes to 800 megabytes, and <b>/dev/sda2</b> from 400 MB to 200 MB). In addition, I'll move <b>/dev/sda2</b> right next to <b>/dev/sda1</b> to keep the partitions in order.</p>
480    
481     <p>But how many partitions there will be in total? One, two, three... four! Phew, I was near to paint myself into a corner. If I created only primary partitions, I'd be unable to create any more partitions on the disk. Thus, I'll create an extended partition instead and two logical partitions within it. Then I'll be able to create more logical partitions later if required.</p>
482    
483     <p>There is one more challenge: moving /home to a separate partition. It's very easy to move the folder itself, but the distro in <b>/dev/sda1</b> will surely be confused if it doesn't find /home when it boots next time. Thus, I must edit its <b>/etc/fstab</b> and configure it to mount the /home partition automatically - before booting the distro itself.
484    
485     <p>Now there are only two decisions left: the numbers and sizes of the new partitions. I decide to install the new distro to <b>/dev/sda5</b> and move /home to <b>/dev/sda6</b>. Let <b>/dev/sda5</b> be 800 megabytes and <b>/dev/sda6</b> 200 MB in size.</p>
486    
487     <p>Now it's time to boot into <b>SystemRescueCD</b>. Graphical mode is required this time.</p>
488     <img src="images/systemrescuecd.png">
489     <p>I close the terminal and open <b>GParted</b> by clicking the third icon in the bottom pane.</p>
490     <img src="images/gparted-00.png">
491     <p>I right-click the partition <b>/dev/sda1</b> and select <b>Resize/Move</b>.</p>
492     <img src="images/gparted-01.png">
493     <p>I enter 799 MB as the new size, click the <b>Free Space Following (MiB)</b> combo box and press <b>Resize/Move</b>.</p>
494     <img src="images/gparted-02.png">
495     <p>I right-click now <b>/dev/sda2</b> and select <b>Resize/Move</b>.</p>
496     <img src="images/gparted-03.png">
497     <p>I enter 0 MB as preceding free space and 200 MB as partition size, click the <b>Free Space Following (MiB)</b> combo box and press <b>Resize/Move</b>.</p>
498     <img src="images/gparted-04.png">
499     <p>I right-click the unallocated area and select <b>New</b>.</p>
500     <img src="images/gparted-05.png">
501 sng 85 <p>I select <b>Extended Partition</b> as the partition type. The size was already 1000 megabytes (the maximum) and as said, an extended partition doesn't contain any filesystem. I click <b>Add</b>.</p>
502 sng 28 <img src="images/gparted-06.png">
503     <p>I right-click the unallocated area within the extended partition and select <b>New</b>.</p>
504     <img src="images/gparted-07.png">
505 sng 85 <p>I choose the ext4 filesystem and enter 799 MB as the partition size. After that, I click first the <b>Free Space Following (MiB)</b> combo box and then <b>Add</b>.</p>
506 sng 28 <img src="images/gparted-08.png">
507     <p>I right-click the remaining unallocated space and select <b>New</b> one more time.</p>
508     <img src="images/gparted-09.png">
509 sng 85 <p>I choose the ext4 filesystem again. The partition size setting was already 200 megabytes (the whole available space), so I just press <b>Add</b>.</p>
510 sng 28 <img src="images/gparted-10.png">
511     <div align="center"><table class="note" border="0" cellpadding="20"><tr><td valign="top"><img src="images/important.png"></td><td>
512     The next step is to commit the changes.<br><br>After that some operations, for example<br>partition deletion, can no longer be undone.
513     </td></tr></table></div>
514     <p>Finally I commit the changes by pressing the rightmost icon in the main bar.</p>
515     <img src="images/gparted-11.png">
516     <p>After <i>slowly</i> reading the warning, I confirm my decisions by pressing <b>Apply</b>.</p>
517     <img src="images/gparted-12.png">
518     <p><b>GParted</b> begins to commit the changes...</p>
519     <img src="images/gparted-13.png">
520     <p>...and when everything is done, it shows me this window that I close.</p>
521     <img src="images/gparted-14.png">
522     <p>Then I can see the brand new partitions.</p>
523    
524     <H3><a name="partitions-home"></a>Moving /home <span class="hideprint">[<a href="#partitions-top" title="go to top of the page">^</a>]</span></H3>
525    
526     <p>I close <b>GParted</b> and launch <b>Terminal</b> by pressing the second icon in the bottom pane.</p>
527    
528     <p>I create directories as mount points:</p>
529    
530     <p class="newcode">mkdir /mnt/sda1<br>
531     mkdir /mnt/sda6</p>
532    
533     <p>Then I mount the partitions:</p>
534    
535     <p class="newcode">mount /dev/sda1 /mnt/sda1<br>
536     mount /dev/sda6 /mnt/sda6</p>
537    
538 sng 85 <p>I copy the directory to the new partition:</p>
539 sng 28
540 sng 85 <p class="newcode">cd /mnt/sda1<br>
541     rsync -aAPSX home/ /mnt/sda6</p>
542 sng 28
543 sng 85 <p>I move the original directory out of my way and create a new directory in place of it:</p>
544    
545     <p class="newcode">mv home home-old<br>
546     mkdir home</p>
547    
548 sng 28 <p>After that, I unmount /dev/sda6, because it no longer needs to be mounted:</p>
549    
550 sng 85 <p class="newcode">umount /dev/sda6</p>
551 sng 28 <img src="images/terminal.png">
552     <p>Now I close <b>Terminal</b> and launch <b>Geany</b> by pressing the fourth icon in the bottom pane.</p>
553     <img src="images/geany-00.png">
554     <p>I select <b>File</b> -> <b>Open</b>.</p>
555     <img src="images/geany-01.png">
556     <p>I press <b>File System</b> and navigate to folder <b>/mnt/sda1/etc</b>.</p>
557     <img src="images/geany-02.png">
558     <p>I double-click the file <b>fstab</b>.</p>
559     <img src="images/geany-03.png">
560     <p>I add the following line:</p>
561    
562     <p class="newcode">/dev/sda6&nbsp;/home&nbsp;ext4&nbsp;defaults&nbsp;0&nbsp;2</p>
563    
564     <p>Finally, I select <b>File</b> -> <b>Save</b>.</p>
565     <img src="images/geany-04.png">
566 sng 85 <p>It's a good idea to reboot the computer now and check if the distribution in <b>/dev/sda1</b> still works. If yes, the /home-old directory can be removed and the disk is ready for the new distro.</p>
567 sng 28
568    
569     </div>
570     <!--<a name="template-top"></a>-->
571    
572     <div id="footer">
573     <div id="docline-bottom"> <a href="sysresccd.html">&lt; PREV</a> <a href="doc.html">UP</a> <a href="recover.html">NEXT &gt;</a> </div>
574 sng 141 <p>Copyright: &#169; <a href="mailto:&#115;&#110;&#103;&#064;&#104;&#101;&#108;&#108;&#117;&#103;&#046;&#103;&#114;?subject=About Clonezilla-SysRescCD v 3.2.0">Spiros Georgaras</a>, 2007-2010<br /><br/>
575 sng 129 Hosted by <a href="http://hellug.gr/index.php/OSullogos/Tautothta?from=Main.HELLUG" target="_blank" title="Hellenic Linux User Group">HEL.L.U.G.</a></p>
576 sng 28 </div>
577     </div>
578 sng 144 <div id="warning" align="center">
579     WARNING<br>
580 sng 146 This is the UNSTABLE version of Clonezilla-SysRescCD<br>
581 sng 149 To access our current stable version, please click <a href="../index.html">here</a>
582 sng 144 </div>
583 sng 28 </body>
584     </html>

Properties

Name Value
svn:executable *

webmaster@linux.gr
ViewVC Help
Powered by ViewVC 1.1.26