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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 your disk is clean 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