0:474h Last Fixed Disk Operation Status
Holds the status of the last fixed disk operation.
Value Last Fixed Disk Operation
02h Address mark not found
03h Attempt to write on write-protected disk
07h Drive parameter activity failed
09h Attempt to DMA across a 64K boundary
0Ah Bad sector flag detected
0Dh Invalid number sectors on format
0Eh Control data address mark detected
0Fh DMA arbitration level out of range
11h ECC corrected data error
FFh Sense operation failed
Note: Use INT 13h, Service 01h, to obtain this