Zenith Z-100 Series, User Manual

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page 17
WINCHESTER SUPPLEMENT
The PREP Utility
During the test passes, PREP kept a record of any bad sec-
tors. After the tests are finished and the superblocks have
been written, PREP will write the bad sector table. As with
the superblock, the table is recorded twice, each with a sepa-
rate read/write head. The bad sector tables are used to "flag"
all known bad sectors and "lock them out," or prevent them
from being used by the system for data storage. It is normal
to have a small number of bad sectors out of the five to twenty
thousand located on the typical Winchester disk.
When the tests are completed, PREP will return control to
the minimum Z-DOS system and you will see the Z-DOS
prompt. Remember, since this is a minimum operating system,
do not use it for normal operation.
Remove the Format Enable jumper as explained in Ap-
pendix B of this Supplement. Do not proceed with any
other operations until you have removed the jumper and
replaced it in its proper place on the board.