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Re: GRUB and that "other" OS...

From: Jochen Hoenicke
Subject: Re: GRUB and that "other" OS...
Date: Fri, 19 Apr 2002 12:02:29 +0200

On Friday, 19. April 2002 00:51, Yoshinori K. Okuji wrote:
> At Thu, 18 Apr 2002 17:16:47 +0200,
> Jochen Hoenicke wrote:
> > This sounds bad.  Grub normally doesn't overwrite the first part
> > (BPB) of the bootsector, which contains information necessary to
> > access the drive. Only the boot code is overwritten.
> That's true for FAT12 and FAT16, but not for FAT32. They changed
> the format and (more importantly) the size of BPB.

You're right; I wasn't aware of this.

Hans, you may try to copy the backup bootsector over the bootsector.  
Do this under linux as root and make sure you don't have a typo:

dd if=/dev/hda1 of=oldbsect bs=512 count=1
dd if=/dev/hda1 of=backupbsect bs=512 count=1 skip=6
dd if=backupbsect of=/dev/hda1 bs=512 count=1

This should recover your FAT32 partition.


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