Commodore Amiga A500 Technical Reference Manual page 182

Error Code Description
No Error
A
code of
00
or
80
is returned if no errors were detected during the
execution of the last operation.
No Index
( l )
The HDC does not detect index signal from drive.
Seek in Progress
(2)
This error code is only returned by the test drive ready command
when the target drive is a hard disk that supports buffered seeks. It
indicates that drive is busy doing a buffered seek. No other command
will be executed on the selected drive, until the seek is completed.
Write Fault
(3)
This error code is returned by the hard disk drives. It indicates that
there was write current to the head when the write gate was off.
This is a very serious problem and should be fixed immediately. No
command will be executed, when this condition is detected.
Drive Not Ready
(4)
No disk operations are executed unless the drive is ready.
Track
0
Not Found (6)
This error code is only returned by the recalibrate command. It indi-
cates that the track
0
status from the drive did not become active
after the maximum necessary steps towards cylinder
0.
Besides drive
malfunction, this type of error usually occurs if more than 1 disk
drive is selected at the same time, either by the HDC or by the option
switches on the supported drives.
Uncorrected Data Error
(1 1 )
For a Winchester drive this error code indicates one or more error
bursts in the data field were beyond the error correction code's abili-
ty to correct. It could also mean that the HDC was unable to obtain a
match of two consecutive syndromes within eight read attempts.
The sector data for the sector in error is sent to the host, prior t o
any retries and correction algorithms used.
Address Mark Not Found
(12)
It indicates that the header for the target sector was found, but its
address mark was not detected. This is treated like a data field error,
except that no data transfer t o the host takes place. If the error per-