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Guide >> Concepts >> Understanding FAT File System >> FAT Partition Boot Sector
FAT Partition Boot Sector
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 (in hex) |
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 |
Learn More
BIOS Parameter Block and Extended BIOS Parameter Block Fields
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