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Article #4780

Re: Clash between FDISK/MBR and scanners (PC)

#4780
From: Kevin Marcus
Date: Wed, 06 Jan 1993 09:05
23 lines
1814 bytes
riordan@tmxmelb.mhs.oz.au (Roger Riordan) writes:
>The command FDISK /MBR is often recommended for removing MBR 
>infectors (Stoned, etc) from hard disks.  However in some 
>circumstances this can cause problems with some scanners.  It 
>appears that some versions of FDISK/MBR rewrite the Master Boot 
>Record only as far as the end of the error messages, leaving the all 
>important partition information unchanged, but also leaving any 
>viral code between the messages and the partition information.

I recently installed Linux, a version of unix for the PC, in addition
to my regular dos partition.  This comes with a small program called
"wini" which is a program, which occupies the MBR to allow me to
choose which OS I would like to boot into.  It's my understanding
OS/half does somethign like this, also, or can do something like this.
If FDISK/MBR REWRITES the MBR with the basic, boring code that
normally is there with DOS, then if I use this method, I will destroy
the wini program, and restrict myself from booting into my Linux
partition.  This is another drawback to fdisk/mbr.
- -- 
|| Kevin Marcus, Computer Virologist.  (619)/457-1836; RE-xxx, TSCAN       ||
|| INET: tck@bend.ucsd.edu       []-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]
||       tck@fold.ucsd.edu       || All I wanted was a Pepsi...            ||
||       datadec@watserv.ucr.edu ||       And she wouldn't give it to me...||
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From: tck@bend.ucsd.edu (Kevin Marcus)
Newsgroups: comp.virus
Subject: Re: Clash between FDISK/MBR and scanners (PC)
Message-ID: <0007.9301071651.AA16031@barnabas.cert.org>
Date: 6 Jan 93 09:05:10 GMT
Sender: virus-l@lehigh.edu
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Approved: news@netnews.cc.lehigh.edu