Int 2F Fn 1508  - Cd-rom - Absolute Disk Read                              [d]

   AX = 1508h
   ES:BX -> buffer
   CX = drive number (0=A:)
   SI:DI = starting sector number
   DX = number of sectors to read

Return: CF set on error
       AL = error code (15=invalid drive,21=not ready)
   CF clear if successful

See Also: AX=1509h