Int 4D Fn 04  - Ti Professional Pc - Disk - Verify Disk Sector Crc(s)      [B]

   AH = 04h
   AL = number of sectors to verify (must be nonzero)
   CH = low eight bits of cylinder number
   CL = sector number 1-63 (bits 0-5)
        high two bits of cylinder (bits 6-7, hard disk only)
   DH = head number
   DL = drive number (bit 7 set for hard disk)
   ES:BX -> data buffer

Return: CF set on error
       if AH = 11h (corrected ECC error), AL = burst length
   CF clear if successful
   AH = status (see #0166 at INT 13/AH=01h)
   AL = number of sectors transferred
   ES:BX -> buffer for last sector processed (including one with errors)

Note:  even though no data is transferred, ES:BX must still be valid

See Also: AH=00h,AH=01h,AH=02h,AH=06h,INT 13/AH=04h