IBM R30 Operator's Manual page 182

2. Do a format without certify.
3. Run a second pass of the erase service aid.
For a newly installed drive, you can insure that all blocks on the drive are overwritten with
your pattern if you use the following procedure:
1. Format the drive.
2. Check the defect map by running the Erase Disk Service Aid.
Note: If you use the "Format and Certify" option, there may be some blocks which get
3. If there are bad blocks in the defect map, record the information presented and ensure
that this information is kept with the drive. This data is used later when the drive is to
be overwritten.
4. Use the drive as you would normally.
5. When the drive is no longer needed and is to be erased, run the same version of the
Erase Disk Service Aid which was used in step 2.
Note: Using the same version of the service aid is only critical if there were any bad
6. Compare the bad blocks which were recorded with the drive in step 3 with those which
now appear in the grown defect map.
Note: If there are differences between the saved data and the newly obtained data,
7. If the bad block list is the same, continue running the service aid to overwrite the disk
with the chosen pattern(s).
Before version 4.2 the Disk Media Service Aid is entered via the Disk Media selection from
the Service Aid Selection Menu. At version 4.2+ the Disk Media service aid is entered via
the Format Media or Certify Media options from the Task Selection Menu.
Optical Disk Service Aids
The Optical Disk Service Aids consist of Initialize, Format and Certify, and Spare Sector
Availability service aids.
Initialize
This service aid is used to format the optical disk without certifying it. This option does
not reassign the defective sectors; however, it is a quick way of formatting after cleaning
the disk.
Format and Certify
This service aid is used to format the optical disk and certify it. The certification process
is drive specific and performs the surface analysis of all user data and spare sectors. The
defective sectors are reassigned.
Spare Sector Availability
This service aid checks the number of spare sectors available on the optical disk. The
spare sectors are used to reassign when defective sectors are encountered during
normal usage or during a format and certify operation. Low availability of spare sectors
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Operator Guide
placed into the grown defect map.
blocks found in step 3.
then all of the sectors on this drive cannot be overwritten. The new bad blocks
are not be overwritten.