<dd>Pointer to the null-terminated string that specifies the <ahref="filename.html">logical drive</a>. The string without drive number means the default drive.</dd>
<dd>Mounting option. 0: Do not mount now (to be mounted on the first access to the volume), 1: Force mounted the volume to check if it is ready to work.</dd>
<p>The file system object is the work area needed for each logical drive. It must be given to the logical drive with this function prior to use any API functions except for <tt>f_mkfs/f_fdisk</tt> function to the logical drive.</p>
<p>If forced mounting is not specified (<tt>opt = 0</tt>), this function always succeeds regardless of the physical drive status. It only clears (de-initializes) the given work area and registers its address to the internal table and no activity of the physical drive in this function. To unregister the work area, specify a NULL to the <ttclass="arg">fs</tt>, and then the work area can be discarded. The volume mount processes, initialize the corresponding physical drive, find the FAT volume in it and initialize the work area, is performed in the subsequent file access functions when either or both of following condition is true.</p>
<p>If the function with forced mounting (<tt>opt = 1</tt>) failed, it means that the file system object has been registered successfully but the volume is currently not ready to work. The volume mount process will be attempted at subsequent file access functions if the file system object is not initialized. (delayed mounting)</p>
<p>If implementation of the disk I/O layer lacks media change detection, application program needs to perform a <tt>f_mount</tt> function after each media change to force cleared the file system object.</p>
