FS_FAT_SYS_CFG

typedef struct fs_fat_sys_cfg {

    FS_SEC_QTY      ClusSize; 

    FS_FAT_SEC_NBR  RsvdAreaSize; 

    CPU_INT16U      RootDirEntryCnt; 

    CPU_INT08U      FAT_Type; 

    CPU_INT08U      NbrFATs; 

  } FS_FAT_SYS_CFG;

A pointer to a FS_FAT_SYS_CFG structure may be passed as the second argument of FSVol_Fmt(). It configures the properties of the FAT file system that will be created.

Members

ClusSize

The size of a cluster, in sectors. This should be 1, 2, 4, 8, 16, 32, 64 or 128. The size of a cluster, in bytes, must be less than or equal to 65536, so some of the upper values may be invalid for devices with large sector sizes.

RsvdAreaSize

The size of the reserved area on the disk, in sectors. For FAT12 and FAT16 volumes, the reserved area should be 1 sector; for FAT32 volumes, 32 sectors.

RootDirEntryCnt

The number of entries in the root directory. This applies only to FAT12 and FAT16 volumes, on which the root directory is a separate area of the file system and is a fixed size. The root directory entry count caps the number of files and directories that can be located in the root directory.

FAT_Type

The type of FAT. This should be 12 (for FAT12), 16 for (FAT16) or 32 (for FAT32). Ths choice of FAT type must observe restrictions on the maximum number a clusters. A FAT12 file system may have no more than 4085 clusters; a FAT16 file system, no more than 65525.

NbrFATs

The number of actual FATs (file allocation tables) to create on the disk. The typical value is 2 (one for primary use, a secondary for backup).

Notes

1. Further restrictions on the members of this structure can be found in FAT File System.