Errors using 96tpi floppy disk
Eric Krohn
krohn at bae.bellcore.com
Sat Apr 27 08:15:32 AEST 1991
I've made numerous attempts to get a 96tpi floppy disk drive to work
with my 7300, but to no avail. The first drive I tried is a Mitsubishi
MF504A-308U -- a 1.4 MB drive for a PC AT strapped (I think correctly)
to force it to "low" density mode (96tpi, 300rpm). I format it with
iv -ivw /dev/fp020 /usr/lib/iv/FD96nl
where FD96nl is a copy of FD10nl with sectors changed from 40 to 80.
Iv formats the drives but fails on the surface check:
Failed in Phase 3 - Surface Check: adding bad block on second write 880
iv: bad block 880 on device with no bad block table
Repeated attempts produce errors on different block numbers -- most are
880 or higher, one was 704.
If I format with FD10nl, it works fine but only uses half the floppy.
Suspecting the floppy drive, I plugged in a Mitsubishi M4852 -- a 720KB
drive that worked in my old Callan Unistar. On this drive, iv "succeeded"
in formatting and surface checking, and I can copy data to the drive.
However, when I read the floppy I get errors starting at logical block 440 --
suspiciously similar to the physical block 880 above.
Now these errors are filling up my /usr/adm/errfile (I use the error daemon
packaged with MGR instead of the stock one):
Sat Apr 20 17:55:25 1991: pid 0: #FDERR ST:8 TR:2E SR:3 DR:FFFFFFC0 DMACNT:FFFF DCRREG:F3 MCRREG:8F00
Sat Apr 20 17:55:25 1991: pid 0: #FDERR ST:8 TR:2E SR:3 DR:FFFFFFC0 DMACNT:FFFF DCRREG:F3 MCRREG:8D00
Sat Apr 20 17:55:26 1991: pid 0: #FDERR ST:8 TR:2E SR:3 DR:FFFFFFC0 DMACNT:FFFF DCRREG:F3 MCRREG:8700
Sat Apr 20 17:55:26 1991: pid 0: #FDERR ST:8 TR:2E SR:3 DR:FFFFFFC0 DMACNT:FFFF DCRREG:F3 MCRREG:8500
Sat Apr 20 17:55:26 1991: pid 0: #FDERR ST:8 TR:2E SR:3 DR:FFFFFFC0 DMACNT:FFFF DCRREG:F3 MCRREG:8500
Sat Apr 20 17:55:26 1991: pid 0: #FDERR ST:8 TR:2E SR:3 DR:FFFFFFC0 DMACNT:FFFF DCRREG:F3 MCRREG:8700
Sat Apr 20 17:55:26 1991: pid 0: #FDERR ST:8 TR:2E SR:3 DR:FFFFFFC0 DMACNT:FFFF DCRREG:F3 MCRREG:8500
Sat Apr 20 17:55:27 1991: pid 0: #FDERR ST:8 TR:2E SR:3 DR:FFFFFFC0 DMACNT:FFFF DCRREG:F3 MCRREG:8D00
Sat Apr 20 17:55:27 1991: pid 0: #FDERR ST:8 TR:2E SR:3 DR:FFFFFFC0 DMACNT:FFFF DCRREG:F3 MCRREG:8D00
Sat Apr 20 17:55:27 1991: pid 0: :S:D::Unrecoverable floppy disk error
What do these mean? Is my problem with the drive(s) or is my 7300 ill
or incapable of using a 96tpi drive? I know others have done this okay.
Help!
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