HP Vectra Technical Reference Manual page 268

The second status returned to the programmer is in the AH register. The register will be loaded
with one of the return codes shown in table 8.7.
Table 8.7
510-8105 Disc Return Status Codes
Hex Value Indication
OOOH
Successful execution, no error
001H
Unknown or bad command, bad device number
002H
Address mark could not be found
003H
Attempted to write on write protected disc
004H
Requested sector could not be found
OOSH
Reset function failed
007H
Initialization failed
008H
DMA overrun, Requested transfer would run over a physical 64KB
boundary in RAM (flexible disc)
009H
DMA overrun, Requested transfer would run over a physical 64KB
boundary in RAM (hard disc)
010H
Bad CRC encountered on flexible disc read
020H
Controller has failed
040H
Attempted Seek failed
080H
Time out occurred during disc operation
OAAH
Disc Drive reports "Not Ready"
OBBH
Undefined error occurred
Disc 259