<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <meta http-equiv="Content-Style-Type" content="text/css"> <link rel="up" title="FatFs" href="../00index_e.html"> <link rel="alternate" hreflang="ja" title="Japanese" href="../ja/dwrite.html"> <link rel="stylesheet" href="../css_e.css" type="text/css" media="screen" title="ELM Default"> <title>FatFs - disk_write</title> </head> <body> <div class="para func"> <h2>disk_write</h2> <p>The disk_write writes sector(s) to the disk.</p> <pre> DRESULT disk_write ( BYTE <span class="arg">drv</span>, <span class="c">/* [IN] Physical drive number */</span> const BYTE* <span class="arg">buff</span>, <span class="c">/* [IN] Write data (may be non aligned) */</span> DWORD <span class="arg">sector</span>, <span class="c">/* [IN] Sector number to write */</span> UINT <span class="arg">count</span> <span class="c">/* [IN] Number of sectors to write */</span> ); </pre> </div> <div class="para arg"> <h4>Parameters</h4> <dl class="par"> <dt>pdrv</dt> <dd>Specifies the physical drive number.</dd> <dt>buff</dt> <dd>Pointer to the <em>byte array</em> to be written.</dd> <dt>sector</dt> <dd>Specifies the start sector number in logical block address (LBA).</dd> <dt>count</dt> <dd>Specifies the number of sectors to write. FatFs specifis 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. 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, read <a href="dread.html">description in disk_read function</a>.</p> <p><em>Application program MUST NOT call this function while FatFs is in use, or FAT structure on the volume can be corrapted.</em></p> </div> <p class="foot"><a href="../00index_e.html">Return</a></p> </body> </html>