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Copyright 1991 David Jurgens |
INT 21,69 - Get/Set Disk Serial Number (Undocumented DOS 4+)
AH = 69h
AL = 00 get serial number
= 01 set serial number
BL = drive (0 = default, 1=A:, 2 = B:, ... )
DS:DX = buffer to contain extended BIOS Parameter Block (BPB, AL=0)
= disk information to set of the form:
Offset Size Description
00 word info level (zero)
02 dword disk serial number (binary)
06 11bytes volume label or "NO NAME " if not present
11 8bytes filesystem type string "FAT12 " or "FAT16 "
returns:
CF = set on error
AX = error code if CF set
= 01 network drive not supported
= 05 no extended BPB found on disk
CF = clear if successful and value in AX is destroyed
AL = 00 buffer filled from Extended BPB on disk
= 01 disk Extended BPB updated from buffer
DS:DX = pointer to returned data, when AL = 0
- copies data from Extended BIOS Parameter Block to buffer
- no critical error is generated on error
- does not work on network drives (returns 01)
- returned buffer (after offset 2) is similar to offsets 27 through
3D of the Extended BPB found in the boot record
- see INT 21,59
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| Esc or Alt-X to exit |
int 21,69 |
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