| <<< FAT Boot Sector, bytes 0-35 (FAT12/16 and FAT32) | Index | FAT12 Boot Sector >>> |
| Bytes | Purpose |
|---|---|
| 0-35 | (See previous table) |
| 36 | BIOS INT 13h (low level disk services) drive number |
| 37 | Not used |
| 38 | Extended boot signature to validate next three fields (0x29) |
| 39-42 | Volume serial number |
| 43-53 | Volume label, in ASCII |
| 54-61 | File system type level, in ASCII. (Generally "FAT", "FAT12", or "FAT16") |
| 62-509 | Not used |
| 510-511 | Signature value (0xaa55) |
| <<< FAT Boot Sector, bytes 0-35 (FAT12/16 and FAT32) | Index | FAT12 Boot Sector >>> |