The Partition Boot Sector contains information that the file system uses to access the volume.
On x86-based computers, the Master Boot Record use the Partition Boot Sector on the system partition to load the operating system kernel files.
The next table describes the fields in the Partition Boot Sector for a volume formatted with the FAT file system.
| Byte Offset | Field Length | Sample Value | Meaning |
|---|---|---|---|
| 00 | 3 bytes | EB 3C 90 | Jump instruction |
| 03 | 8 bytes | MSDOS5.0 | OEM Name in text |
| 0B | 25 bytes | BIOS Parameter Block | |
| 24 | 26 bytes | Extended BIOS Parameter Block | |
| 3E | 448 bytes | Bootstrap code | |
| 1FE | 2 bytes | 0x55AA | End of sector marker |
See also BIOS Parameter Block and Extended BIOS Parameter Block Fields
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