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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 data buffer */
  DWORD <em>SectorNumber</em>,  /* Start sector number */
  BYTE <em>SectorCount</em>     /* Number of sectros to read */
);
</pre>
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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 byte array to store the read data. The buffer size of number of bytes to be read, sector size * sector count, is required. The memory address specified by upper layer may or may not be aligned to word boundary.</dd>
<dt>SectorNumber</dt>
<dd>Specifies the start sector number in logical block address (LBA).</dd>
<dt>SectorCount</dt>
<dd>Specifies number of sectors to read. The value can be 1 to 255.</dd>
</dl>
</div>
 
 
<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 hard error occured during the read operation and could not recover it.</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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