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Int 25 - DOS 3.31+ - Absolute Disk Read (>32m Hard-disk Partition) [D]
CX = FFFFh
AL = drive number (0=A, 1=B, etc)
DS:BX -> disk read packet (see below)
Return: same as above
Notes: partition is potentially >32M (and requires this form of the call) if
bit 1 of device attribute word in device driver is set
original flags are left on stack, and must be removed by caller
this call bypasses the DOS filesystem
See Also: INT 13/AH=02h,INT 25,INT 26/CX=FFFFh
Format of disk read packet:
Offset Size Description
00h DWORD sector number
04h WORD number of sectors to read
06h DWORD transfer address
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