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FAT: Difference between revisions
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Glauxosdever (talk | contribs) m (Old "number of sectors" is at 0x13, not 0x16) |
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|Bootable partition signature 0xAA55.
|}
=== FSInfo Structure (FAT32 only) ===
{| {{wikitable}}
|-
! Offset (decimal)
! Offset (hexadecimal)
! Length (in bytes)
! Meaning
|-
| 0
| 0x0
| 4
|Lead signature (must be 0x41615252 to indicate a valid FSInfo structure)
|-
| 4
| 0x4
| 480
|Reserved, these bytes should never be used
|-
| 484
| 0x1E4
| 4
|Another signature (must be 0x61417272)
|-
| 488
| 0x1E8
| 4
|Contains the last known free cluster count on the volume. If the value is 0xFFFFFFFF, then the free count is unknown and must be computed. However, this value might be incorrect and should at least be range checked (<= volume cluster count)
|-
| 492
| 0x1EC
| 4
|Indicates the cluster number at which the filesystem driver should start looking for available clusters. If the value is 0xFFFFFFFF, then there is no hint and the driver should start searching at 2. Typically this value is set to the last allocated cluster number. As the previous field, this value should be range checked.
|-
| 496
| 0x1F0
| 12
|Reserved
|-
| 508
| 0x1FC
| 4
|Trail signature (0xAA550000)
|}
=== File Allocation Table ===
| |||