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<TITLE>The Answer Guy 48: Clearing Lilo from MBR</TITLE>
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<H4>"The Linux Gazette...<I>making Linux just a little more fun!</I>"</H4>
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<H1><A NAME="answer">
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<font color="#B03060">The Answer Guy</font>
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<H4>By James T. Dennis,
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<a href="mailto:linux-questions-only@ssc.com">linux-questions-only@ssc.com</a><BR>
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LinuxCare,
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<A HREF="http://www.linuxcare.com/">http://www.linuxcare.com/</A>
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<H3 align="left"><img src="../../gx/dennis/qbubble.gif"
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height="50" width="60" alt="(?) " border="0"
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>Clearing Lilo from MBR</H3>
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<p><strong>From Norman Elliott on Thu, 23 Sep 1999
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</strong></p>
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<P><STRONG>
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Just read the item on clearing lilo.
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</STRONG></P>
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<P><STRONG>
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All I do is boot from a Dos ( 5 or greater ) boot disc and issue the
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command:
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</STRONG></P>
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<P><STRONG><BlockQuote><Code>
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fdisk <TT>/mbr</TT>
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</Code></BlockQuote></STRONG></P>
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<P><STRONG>
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that seems to fix anything including boot sector viruses.
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Maybe Linux fdisk would take the same parameter.
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I enjoy your column, keep up the good work,
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best wishes,
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</STRONG></P>
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<P><STRONG>
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norm
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</STRONG></P>
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<BLOCKQUOTE><IMG SRC="../../gx/dennis/bbub.gif" ALT="(!)"
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HEIGHT="28" WIDTH="50" BORDER="0"
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>
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The <TT>/MBR</TT> option was undocumented and only introduced in
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MS-DOS 5.0. I don't remember the question to which you
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were referring. If I didn't mention FDISK <TT>/MBR</TT> it was
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probably because I was not assuming that the user was
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trying to restore an MS-DOS 5.0 or later boot loader
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to their system.
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</BLOCKQUOTE>
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<BLOCKQUOTE>
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Linux fdisk is a different program and doesn't
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touch the boot code in the MBR. It only works on the
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partition tables (which comprise the last 66 bytes of the
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MBR and possibly a set of others for extended partitions).
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</BLOCKQUOTE>
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<BLOCKQUOTE>
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There are several Linux programs which do write boot
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records. <TT>/sbin/lilo</TT> is the most commonly used. 'dd'
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will do in a pinch (if you have a .bin image to put into
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place).
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</BLOCKQUOTE>
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<BLOCKQUOTE>
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BTW: don't count on <TT>/MBR</TT> to fix a virus. Some viruses
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encrypt portions of your filesystem, thus causing major
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problems if they aren't removed corectly. To prevent
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infection by boot sector viruses, disable the "floppy
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boot" options in your BIOS. You should only enable those
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long enough to perform an OS installation or system recovery
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and disable it immediately thereafter. To prevent viral
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infect by "multi-partite" and "file infector" viruses,
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stop running MS-DOS. To avoid MS Windows macro viruses,
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avoid MS Office, MS Exchange and related software (with
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virus^H^H^H^H macroing hooks built into them).
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</BLOCKQUOTE>
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<!-- sig -->
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<P> <hr> <P>
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<H5 align="center"><a href="http://www.linuxgazette.com/copying.html"
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>Copyright ©</a> 1999, James T. Dennis
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<BR>Published in <I>The Linux Gazette</I> Issue 48 December 1999</H5>
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<H6 ALIGN="center">HTML transformation by
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<A HREF="mailto:star@starshine.org">Heather Stern</a> of
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Starshine Technical Services,
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<A HREF="http://www.starshine.org/">http://www.starshine.org/</A>
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</H6>
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