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<div class="para func">
<h2>disk_write</h2>
<p>The disk_write writes sector(s) to the disk.</p>
<pre>
DRESULT disk_write (
  BYTE <em>Drive</em>,          <span class="c">/* Physical drive number */</span>
  const BYTE* <em>Buffer</em>,  <span class="c">/* Pointer to the write data (may be non aligned) */</span>
  DWORD <em>SectorNumber</em>,  <span class="c">/* Sector number to write */</span>
  BYTE <em>SectorCount</em>     <span class="c">/* Number of sectors to write */</span>
);
</pre>
</div>

<div class="para arg">
<h4>Parameters</h4>
<dl class="par">
<dt>Drive</dt>
<dd>Specifies the physical drive number.</dd>
<dt>Buffer</dt>
<dd>Pointer to the <em>byte array</em> to be written. Note that the specified memory address is not that always aligned to word boundary. If the hardware does not support misaligned data transfer, it must be solved in this function.</dd>
<dt>SectorNumber</dt>
<dd>Specifies the start sector number in logical block address (LBA).</dd>
<dt>SectorCount</dt>
<dd>Specifies the number of sectors to write. The value can be 1 to 128. Generally, a multiple sector transfer request must not be split into single sector transactions to the device, or you will never get good write performance.</dd>
</dl>
</div>


<div class="para ret">
<h4>Return Values</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 write operation and could not recover it.</dd>
<dt>RES_WRPRT</dt>
<dd>The medium is write protected.</dd>
<dt>RES_PARERR</dt>
<dd>Invalid parameter.</dd>
<dt>RES_NOTRDY</dt>
<dd>The disk drive has not been initialized.</dd>
</dl>
</div>


<div class="para desc">
<h4>Description</h4>
<p>This function is not required in read only configuration.</p>
</div>


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