<p>The specified memory address is not that always aligned to word boundary because the type of pointer is defined as <tt>BYTE*</tt>. For more information, refer to the description of <ahref="dread.html"><tt>disk_read</tt></a> function.</p>
<p>Generally, a multiple sector transfer request must not be split into single sector transactions to the storage device, or you will never get good write throughput.</p>
<p>FatFs expects delayed write feature of the disk control layer. The write operation to the media need not to be completed due to write operation is in progress or data is stored into the write-back cache when return from this function. But write data on the <ttclass="arg">buff</tt> is invalid after return from this function. The write completion request is done by <tt>CTRL_SYNC</tt> command of <tt><ahref="dioctl.html">disk_ioctl</a></tt> function. Therefore, if a delayed write feature is implemented, the write throughput will be improved.</p>
