Re: Boot Sector virus



On Sun, 24 Sep 2006 12:01:28 +0200, Runlevel0 <runlevel0@xxxxxxxxxxx>
Marek Kalisz wrote:

Recently during booting I discovered a momentary message: MBR Error 2.

First of all try repairing the MBR from the recovery console:

FIXMBR

This will repair the MBR.

Yes... as long as you don't need a non-standard MBR to live...

YOu can also use FIXBOOT first, so that you ensure the MBR is actually
erased and rewritten.

No, that's not what FixBoot does.

MBR = Master Boot Record, which is system- rather than OS-level code
(i.e. it's an extension of the BIOS, rather than part of any OS). It
contains the partition table, and is expected to locate an active
primary partition and jump into it to start that OS.

PBR = Partition Boot Record, which is the start of the OS. It is
this, not the MBR, that FixBoot will rebuild.

MBR should be the same for a given system, irrespective of what OS you
use. Most systems use standard MBR code, but some may not - e.g. boot
managers, code that replaces capacity-limited BIOS HD code, etc.

PBR should be the same for a given OS, irrespective of the system,
save for some data values. The PBR for NT-based OSs will look for and
load NTLDR from FATxx or NTFS; the PBR for DOS and Win9x will look for
and load IO.SYS from the FATxx file systems it can understand.



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