Restoring Catalogs; The Error Rate Test-Discs - HP 3563A Operating Manual

Disc/Plotter/HP-IB
Operations
Using the Disc Service Functions

Restoring Catalogs

Catalogs can be restored if power was lost during a data transfer or if the catalog appears corrupted.
RESTOR CATLOG
If finds a catalog sector that it determines to be bad, it clears that catalog sector.
For this reason, be certain that a catalog definitely needs restoring before you press
CATLOG.
The next step after pressing
As
restored catalog. with
files for the disc (for restoration you must use the original number of files). The name and number
RESTOR CATLOG
of files entered after
If
sector) is bad. the volume sector is good, these entries are ignored.
If you terminate this entry with the
OVER WRITE
terminate it with the
choice because restoration starts by validating the catalog, then it searches for files that may exist in
data sectors addressed by bad catalog sectors. It attempts to validate all files in ascending order, and
if it finds a file out of order it assumes that sector is bad. If no valid files are found in a sector, the
message "BAD Cat Sector nnn" is displayed, and that sector is cleared. The "Restore Catalog"
display at the end of restoration shows the number of bad sectors found.
Restoration is fast if all files can be located in the order indicated in the catalog. If some sectors are
determined bad and need to be spared, restoration can take a long time. It can, however, be
gracefully aborted by pressing
The Error Rate Test - Discs
This test checks for data reading errors. The error rate test
data on the disc. Because the disc drive's error correction circuitry is disabled while the
ERT
running, the records all errors-both correctable and uncorrectable. This differs from the run
time log, which shows only uncorrectable errors.
ERT
The starts by performing a full-volume error test, noting bad sectors in the
ERT
reads the log to check each bad sector individually. Each bad sector is checked
if errors occur consistently. The
historically produced errors. These are checked
ERT
from disc when the
1 1 -30
RESTOR CATLOG
is to use the alpha mode to enter a name for the
INIT DISC INIT CATLOG,
and
is pressed are used only if the volume sector (the first
ENTER
softkey, the analyzer only checks for bad sectors. If you
soft key, it actually performs the restoration. You are given this
ABORT HP-IB
and started again.
ERT
then reads the run time log to individually check sectors that
is finished; it shows the number of times each error occurred.
you may add a comma and the number of
(ERT)
is read-only, so it does not destroy
20 times also. The final
RESTOR
ERT
is
ERT
log. Next, it
20 times to see
be
ERT
log can retrieved