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Service Information
7957 A/7958A
(no header is sent)
entry:
current phys cyl
current phys head
current phys sector
(current logical sector)
current logical cyl
current logical head
c~rrent
logical sector
error byte
loop count when error occurred
error byte format:
2 bytes
byte
byte
(equals 0)
2 bytes
byte
byte
byte
byte
bit 7
=
byte sync (no data sync or sector overrun)
bit 6
=
error in header field
bit 5
error in data field
bit
4
=
unrecoverable data error
(a 11 retries exhausted)
bit 3
ECC marginal data error
bit
2
=
retry marginal data error
(more than
1
retry requ ired)
bit
1
recoverable on the first retry
bit
0
FIFO data lost or track offset invoked
The state of the test is saved when an error or fault occurs. After reporting the
error/fault, the test may be continued by re-sending the ERT command sequence
with the loop count set to zero.
At the end of the test (loop count exhausted), one byte (containing a zero) tagged
with EOI will be sent to the host.
4-63. Random Read Only Error Rate Test (Log Option)
MICRO OPCODE
PARAMETERS
OCCH
LOOP
(204)
(0-255) 255 implies infinite loop
This routine functions like the Read Only Error Rate test. The one exception is
that the TEST AREA is generated randomly. This is done by generating a
random starting address and then generating a random length between I sector
and 64 sectors. If the random length exceeds the length between the starting
address and the end of the disc volume, the length will be truncated to stop at
the volume boundary.
Refer to paragraph 4-62 for details on the execution message.
4-64. Read Revision Numbers
MICRO OPCODE : OC3H
(195)
PARAMETERS
: none
4-38
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