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