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0040h:0074h           Last Fixed Disk Operation Status

    Length: 1 byte

    Holds the status of the last fixed disk operation.

                Value   Last Fixed Disk Operation
                00h     No error
                01h     Invalid command
                02h     Address mark not found
                03h     Attempt to write on write-protected disk
                04h     Sector not found
                05h     Reset failed
                07h     Drive parameter activity failed
                08h     DMA overrun
                09h     Attempt to DMA across a 64K boundary
                0Ah     Bad sector flag detected
                0Bh     Bad cylinder found
                0Dh     Invalid number sectors on format
                0Eh     Control data address mark detected
                0Fh     DMA arbitration level out of range
                10h     ECC data error
                11h     ECC corrected data error
                20h     Controller failure
                40h     Seek failure
                80h     Time out
                AAh     Drive not ready
                BBh     Undefined error
                CCh     Write fault
                E0h     Status error
                FFh     Sense operation failed

    Use Int 13h, Service 01h, to obtain this information.