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<title>FatFs - disk_read</title>
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<div class="para">
<h2>disk_read</h2>
<p>The disk_read function reads sector(s) from the disk drive.</p>
<pre>
DRESULT disk_read (
BYTE <em>Drive</em>, /* Physical drive number */
BYTE* <em>Buffer</em>, /* Pointer to the read buffer */
DWORD <em>SectorNumber</em>, /* Sector number to read from */
BYTE <em>SectorCount</em> /* Number of sectros to read */
);
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<div class="para">
<h4>Parameters</h4>
<dl class="par">
<dt>Drive</dt>
<dd>Specifies the physical drive number.</dd>
<dt>Buffer</dt>
<dd>Pointer to the read buffer to store the read data. The buffer size of number of bytes to be read is required.</dd>
<dt>SectorNumber</dt>
<dd>Specifies the start sector number in logical block address.</dd>
<dt>SectorCount</dt>
<dd>Specifies number of sectors to read. The value can be 1 to 255.</dd>
</dl>
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<div class="para">
<h4>Return Value</h4>
<dl class="ret">
<dt>RES_OK (0)</dt>
<dd>The function succeeded.</dd>
<dt>RES_ERROR</dt>
<dd>Any error occured during the read operation.</dd>
<dt>RES_PARERR</dt>
<dd>Invalid parameter.</dd>
<dt>RES_NOTRDY</dt>
<dd>The disk drive has not been initialized.</dd>
</dl>
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<p class="foot"><a href="../00index_e.html">Return</a></p>
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