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<h2>FATFS</h2>
<p>The <tt>FATFS</tt> structure holds dynamic work area of individual logical drives. It is given by application program and registerd/unregisterd to the FatFs module with f_mount function. Following members are in standard configuration. There is no member that can be changed from the application program.</p>
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typedef struct _FATFS_ {
BYTE fs_type; /* FAT sub type */
BYTE drive; /* Physical drive number */
BYTE csize; /* Number of sectors per cluster */
BYTE n_fats; /* Number of FAT copies */
BYTE wflag; /* win[] dirty flag (1:must be written back) */
BYTE fsi_flag; /* fsinfo dirty flag (1:must be written back) */
WORD id; /* File system mount ID */
WORD n_rootdir; /* Number of root directory entries (0 on FAT32) */
#if _FS_REENTRANT
_SYNC_t sobj; /* Identifier of sync object */
#endif
#if _MAX_SS != 512
WORD s_size; /* Sector size */
#endif
#if !_FS_READONLY
DWORD last_clust; /* Last allocated cluster */
DWORD free_clust; /* Number of free clusters */
DWORD fsi_sector; /* fsinfo sector */
#endif
#if _FS_RPATH
DWORD cdir; /* Current directory (0:root)*/
#endif
DWORD sects_fat; /* Sectors per fat */
DWORD max_clust; /* Maximum cluster# + 1. Number of clusters is max_clust - 2 */
DWORD fatbase; /* FAT start sector */
DWORD dirbase; /* Root directory start sector (Cluster# on FAT32) */
DWORD database; /* Data start sector */
DWORD winsect; /* Current sector appearing in the win[] */
BYTE win[_MAX_SS];/* Disk access window for Directory/FAT */
} FATFS;
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