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From: Carlos Davila on 11 Mar 2010 18:10
"That would be /boot/grub."

correct, my typo.


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From: Stefan Monnier on 11 Mar 2010 18:10
> this evidently does not overwrite the boot sector, does grub-install do
> this? I have yet to run grub-install. Of course, this would not explain why
> my system still boots after deleting the vmlinuz files.

Yes it could: you installed `grub' on your Debian system, but you
haven't activated it, so you're still booting with Lilo, which uses
a "list of disk blocks" to find the kernel, so as long as those disk
blocks don't get overwritten, it'll boot just fine.


Stefan


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From: Clive McBarton on 11 Mar 2010 19:30
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Stefan Monnier wrote:
>> this evidently does not overwrite the boot sector, does grub-install do
>> this? I have yet to run grub-install. Of course, this would not explain why
>> my system still boots after deleting the vmlinuz files.
>
> Yes it could: you installed `grub' on your Debian system, but you
> haven't activated it, so you're still booting with Lilo, which uses
> a "list of disk blocks" to find the kernel, so as long as those disk
> blocks don't get overwritten, it'll boot just fine.


The bootsector which Carlos posted here (uuencoded) is a grub boot
sector. It contains the characteristic strings

"GRUB .Geom.Hard Disk.Read. Error"

which can be seen by uudecoding and looking at it with hexedit.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.9 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org

iEYEARECAAYFAkuZiNwACgkQ+VSRxYk4408zQACfdylkPQHTy6A9o+pZVxLAuEPC
BXAAoJQ8RVwHQyL+EyZJ073H3C1ZG0HG
=6DC8
-----END PGP SIGNATURE-----


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From: Carlos Davila on 11 Mar 2010 21:30
Thib,

You nailed it. After having juggled hard drives around, I ended up
commenting out the line that mounts /dev/hda1 on /boot in fstab. Fixed
that, copied grub images to /boot/grub, and ran grub-install and
everything works as it should.

Thanks to all,
cd


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From: Tom H on 13 Mar 2010 20:20
>>> MS-Windows used to have an undocumented switch "fdisk /mbr" which would
>>> remap the MBR and erase any copy of lilo or grub present.  I don't know if
>>> they still have that option.
>>
>> Undocumented?
>>
>> The command above works pre-XP.
>>
>> For XP, it is fixmbr and/or fixboot..
>>
>> For Vista and Seven, it is bootrec /fixmbr and/or bootrec /rebuildbcd.
>
> Thank you!  I'm going to be needing that information soon to re-install a DOS-style
> master boot record on a number of machines and move lilo to the boot sector
> for the /boot partition.

You're welcome. I hope that you have an actual Windows CD/DVD to use
the above commands given that most manufacturers ship recovery CDs
only that may or may not allow you to use these commands. :(


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