 the read/write function must work in <tt>FF_MAX_SS</tt> bytes/sector.</td></tr>
<tr><td>GET_BLOCK_SIZE</td><td>Retrieves <em>erase block size in unit of sector</em> of the flash memory media into the <tt>DWORD</tt> variable that pointed by <tt class="arg">buff</tt>. The allowable value is 1 to 32768 in power of 2. Return 1 if the value is unknown or non flash memory media. This command is used by only <tt>f_mkfs</tt> function and it attempts to align data area on the suggested block boundary. It is requir