sists after
8
attempts, an auto-restore
is
performed, followed by a
reseek, and another
8
attempts to read the desired LSA.
Sector Not Found. Read
(1
3)
The HDC found the correct cylinder and head but not the target sec-
tor.
Sector Not Found, Write
(14)
The HDC found the correct cylinder and head but not the target sec-
tor.
I.D. Not Found (15)
If the ID field cannot be read correctly after all the retries have been
exhausted, this error code
is
set and the operation terminated. The
WDC searches for the ID field twice, followed by another
8
attempts
by the HDC.
Format Error
(1
A)
During a check track command the HDC detects one of the following
errors:
1) Track not found.
2) Bad ID
Illegal Parameters (20.21, 22)
These error codes, invalid command
(20), illegal LSA (21), and illegal
LUN
(22) are self explanatory.
HDC
RAM
Error
(30)
During internal diagnostic the HDC detects a
RAM
error.
HDC ROM
Checksum Error (31)
During internal diagnostic the HDC detects a ROM
checksum error.
Host DMA Failure
This error code is set whenever invalid status
is
read from the DMA
during any data or command access. For most operations the status
checked
is
E0 (hex), except for a block write. In this case the valid
status checked for
is
AO. The status is read continuously for about
20
mS.
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