savelij13
3bb1c09ac4
- Separated out OS dependent code on reentrant cfg. - Added multiple sector size support.
59 lines
3.0 KiB
HTML
59 lines
3.0 KiB
HTML
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<html lang="en">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<meta http-equiv="Content-Style-Type" content="text/css">
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<link rel="up" title="FatFs" href="../00index_e.html">
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<link rel="stylesheet" href="../css_e.css" type="text/css" media="screen" title="ELM Default">
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<title>FatFs - File and Path name on the FatFs module</title>
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</head>
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<body>
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<div class="para">
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<h2>File and Path name on the FatFs module</h2>
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<p>The format of file and path name on the FatFs module is similer to MS-DOS. However it does not have a concept of current directory like OS oriented file system. All objects on the drive are always specified in full path name from the root directory.</p>
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<pre>
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"[<em>drive#</em>:][/]<em>directory</em>/<em>file</em>"
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"file1.txt" A file on the drive 0
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"/file1.txt" (same as above)
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"dir1/dir2/file1.txt" A file on the drive 0
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"2:dir3/file2.txt" A file on the drive 2
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"2:/dir5" A directory on the drive 2
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"" The root directory on the drive 0
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"/" (same as above)
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"2:" The root directory on the drive 2
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</pre>
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<p>The FatFs module supports long file name and 8.3 format file name. The long file name can be handled when _USE_LFN option is selected. The sub directories are separated with a / or \. Heading separator is ignored and it may be exist or omitted.</p>
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<p>The logical drive number is specified in a numeral with a colon. When the drive number is omitted, it is assumed as default drive (0:).</p>
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</div>
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<p><br></p>
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<div class="para">
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<h2>Correspondence between logical/physical drive</h2>
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<p>In default, the FatFs module has work areas that called <em>file system object</em> for each logical drive. The logical drive is bound to the physical drive that has same drive number, and the first partition is mounted. When <tt>_MULTI_PARTITION</tt> is specified in configuration option, each individual logical drive can be bound to any physical drive/partition. In this case, a drive number resolution table must be defined as follows:</p>
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<pre>
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Example: Logical drive 0-2 are assigned to three pri-partitions on the physical drive 0 (fixed disk)
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Logical drive 3 is assigned to physical drive 1 (removable disk)
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const PARTITION Drives[] = {
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{0, 0}, /* Logical drive 0 ==> Physical drive 0, 1st partition */
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{0, 1}, /* Logical drive 1 ==> Physical drive 0, 2nd partition */
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{0, 2}, /* Logical drive 2 ==> Physical drive 0, 3rd partition */
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{1, 0} /* Logical drive 3 ==> Physical drive 1 */
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};
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</pre>
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<p>There are some consideration when use <tt>_MULTI_PARTITION</tt> configuration.</p>
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<ul>
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<li>Only pri-partition (0-3) can be mounted.</li>
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<li>When the physical drive have no partition table (super floppy format), the partition number is ignored.</li>
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<li>The physical drive that has two or more logical drives must be fixed drive.</li>
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</ul>
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</div>
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</body>
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</html>
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