Commodore Amiga A500 Technical Reference Manual page 185

The Restore command positions the heads to cylinder 0. It is usually
issued by the host when the drive has been turned on, or before a
format drive operation is initiated by the host.
Possible Error Codes
No error, invalid command, Track 0 not found, drive not ready, write
fault, DMA error.
Request Status (Class 0,
Action
Opcode 3)
Send the host four bvtes of error information for the specified drive.
The status of the last command executed may have already set the
error register but the execution of this command will not set any
new bits.
If
however, the command requesting the status is invalid,
then the previous command status will be lost.
Possible Error Codes
No error, invalid command, last operation status,
DMA
error.
Check Track Format
Action
(Class 0, Opcode S)
Verify that the specified track is formatted with the correct number
of logical sectors.
A
multiple read command is issued by the HDC to
verify all the ID fields on that track and the data read back from the
disk is discarded. Retries maybe enabled if desired.
Possible Error Code
No error, invalid command, invalid sector address, IDNF error, drive
not ready, write fault, invalid
LUN,
seek not complete, DAM found,
uncorrectable data error,
DMA
error.
Format Track (Class 0,
Action
Opcode 6)
The format track command is used for initializing the ID and data
fields on a specified track. The current contents of the specified track
are ovenvritten. This command is useful for marking any bad sectors
or tracks after the entire disk surface has been formatted. Assign-
ment of alternate tracks or simply not specifying bad logical address-
es is best handled by the host driver routines in the interest of flexi-
bility and reducing onboard firmware requirements.
Possible Error Codes