55 AA
MBR boot sector signature
The two-byte signature at offset 510 of a bootable Master Boot Record. The BIOS refuses to boot a sector that does not end with 55 AA.
Similar magic numbers
| value | name | category |
|---|---|---|
| 55 43 45 58 | Unicode extensions | file-signature |
| 55 46 41 C6 D2 C1 | UFA compressed archive | file-signature |
| 55 6E 46 69 6E 4D 46 | Measurement Data Format file | file-signature |
| 5432 | PostgreSQL port | port |
| 58 2D | Exchange e-mail | file-signature |