Thread View: comp.virus
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Started by vpk2!john
Wed, 11 Nov 1992 14:09
Virus-like behavior of DOS 5.0 chkdsk (PC)
Author: vpk2!john
Date: Wed, 11 Nov 1992 14:09
Date: Wed, 11 Nov 1992 14:09
48 lines
2350 bytes
2350 bytes
This is an excerpt of a message I posted to comp.os.msdos.misc,
that I thought might be of interest.
(This is NOT an official report from Microsoft or AT&T. It's just
my own friendly posting to try to help)
Program: chkdsk
O/S : MS-DOS 5.0
Symptoms: Users running chkdsk with the /f option have 256 copies
of the FAT written onto their hard disk starting at the
first copy of the FAT. The result being that all directory
information and a significant amount of the data in the data
area are irrecoverably destroyed.
Affected users: Any users using 256 sector FAT's.
How to tell if you're at risk:
Run chkdsk WITHOUT the '/f' option and check the
"Total allocation units on disk". If this number is
more than 65280, you're at risk. DO NOT USE CHKDSK TO
CORRECT ANY DISK PROBLEMS if this is the case. You'll
trash your disk.
Solution: Call Microsoft and request the 5.00A upgrade. They know
about the problem and they've fixed it. They've also done
some diddling with the following programs: (though I don't
know what they did to them.)
deloldos.exe diskcomp.com diskcopy.com
doshelp.exe dosshell.exe dosswap.exe
emm386.exe expand.exe format.com
himem.sys mirror.com qbasic.exe
recover.exe setver.exe undelete.exe
xcopy.exe
______Opinions stated are my own. Transcripts available by request______
===
=--==== AT&T Canada Inc. John Benfield
=----==== 3650 Victoria Park Ave. Network Support Analyst (MIS)
=----==== Suite 700
==--===== Willowdale, Ontario attmail : ~jbenfield
======= M2H-3P7 email : uunet.ca!attcan!john
=== (416) 756-5221 Compu$erve: 72137,722
____Eagles may soar, but weasels don't get sucked into jet engines._____
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