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FAT directory entries
A basic FAT directory entry contains:
- 8 character BASE filename
- 3 character file extension
- 1 byte attribute with RO, System, Hidden etc
- 4 byte date and time information
- 2 bytes (16-bit) cluster-number for FIRST cluster
- 4 bytes (32-bit) filesize, maximum value 2 Gb
OS/2, FAT32 and VFAT may add:
- 2 bytes index value to OS2 extended-attributes
- 2 bytes extra cluster number, making it 32-bit
- Extra create/access date and time fields (VFAT)