[comp.virus] CMOS devuce settings

vancleef@nas.nasa.gov (Robert E. Van Cleef) (01/03/91)

I had what I thought was a viral infection on my PC Clone system
although VIRASCAN did not detect any problems. What I was seeing was
recently updated files had problems. Finally the system started
reporting BAD SECTORs in these files. This was only on my 3.5" 1.4 MB
floppy disk.

What had happened is... My system had been hit with a power surge that
wiped out the CMOS table entries. When I reconfigured the system, I
set up drive B: as a 5.25" 1.2 MB system instead of a 3.5" 1.4 MB
system. This allowed me to be able to read the contents of the disk!
However, anytime I wrote to the disk it screwed it up. Even using
NORTON utilities worked half way. Norton's disk check would report bad
blocks and mark them as such....

I am/was surprised that things actually worked as well as they did, as
I would have expected the improperly configured disk not to work at
all.

- --
Bob Van Cleef 			vancleef@nas.nasa.gov
NASA Ames Research Center	(415) 604-4366
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Perception is reality...