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- It is possible to still use a hardisk even if track 0 is bad. In the
- manufacturing of hard disk media it is not unusual to have 10% of the
- total disk space unusable as bad tracks. So in a 10 meg drive 100,000
- unusuable sectors is not considered bad. If you have a disk that has less
- bad sectors than this then consider yourself luck. If you disk is clean
- then consider that unusual. In a full height drive the error rate is less
- and it is not unusual to have a clear disk with 0 bad tracks. Use a product
- like scavenge or Nortons Utilities to isolate these bad tracks. If your bad
- track is at track 0 all is not lost. Although fdisk from msdos or ibm formats
- tracks from 0 to xxx cylinders and then will create up to 4 hard disk
- partitions starting at the first sector you can use fdisk
- to create a partition of 0 to 2, use the remainder as the dos partition and set
- this to be the active partition. The disk is still usuable for dos although
- not bootable since if you reformat then all partitions are lost.
- However Digital's
- CPM 86, or concurrent CPM also allows you to set up partitions, for CP/M and
- DOS but in this case the CPM and dos partitions are formatted AFTER they are
- designated. Thus you can designate a DOS partition from 2 to
- xxx cylinders, have
- CPM/86 format it in dos and transfer the system . THe disk is now bootable. My
- 33 meg has tracks 0-3 bad. Thats the boot sector and dir tracks. By using CP/M
- 86 to do the initial partitions I am able to reformat only the dos partition,
- in this case from 4 to 653 , transfer the system and it boots with no trouble.
-
- Nathan Goldenthal