GRUB MBR and restoring a partition

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Old 08-07-2011
GRUB MBR and restoring a partition

I tried to install another Linux O.S along with MS and to make two Linux's and one windows.Usually when I try this GRUB losses the ability to boot the first Linux install. It did it again. I would really like to get this first install bootable again.

Here are some facts.

-I have a rescue disk , a XP installation disk and a live Ubuntu Disk.

-If I use Gparted in the second Linux install; here by refered to as the second, I can mount the lost Distro but not of coarse boot it. From here I can get all the Grub files from this install.

-If I use the Rescue disk I can get the starting and ending sectors of the second install.

-The MBR is only 64 bytes long so this should not really be a burden.

So I need to either get the last installed O.S to chain load the lost one or get the MBR to point to the lost partitions boot sector.

Something I don't understand is how grub tranforms the MBR sector info to paths to find the partitions.

Any help will be appreciated!Smilie
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GRUB-INSTALL(8) 							FSF							   GRUB-INSTALL(8)

grub-install - install GRUB on your drive SYNOPSIS
grub-install [OPTION] install_device DESCRIPTION
Install GRUB on your drive. -h, --help print this message and exit -v, --version print the version information and exit --root-directory=DIR install GRUB images under the directory DIR instead of the root directory --grub-shell=FILE use FILE as the grub shell --no-floppy do not probe any floppy drive --force-lba force GRUB to use LBA mode even for a buggy BIOS --recheck probe a device map even if it already exists INSTALL_DEVICE can be a GRUB device name or a system device filename. grub-install copies GRUB images into the DIR/boot directory specfied by --root-directory, and uses the grub shell to install grub into the boot sector. The grub source distribution carries this script to ease the installation of grub as a boot loader. In Suse Linux however, grub installa- tion is much better handled by Yast; use of this script is generally discouraged and therefore unsupported. Consequently, the script has been renamed to grub-install.unsupported. In order to (re-)install grub for the currently running system, simply use Yast. For an installation aiming at a differing system, the crafting of an appropriate and grub shell script is strongly advised, e.g. "grub --batch < tar- get-grub.conf" SEE ALSO
The full documentation for grub-install is maintained as a Texinfo manual. If the info and grub-install programs are properly installed at your site, the command info grub-install should give you access to the complete manual. grub-install (GNU GRUB 0.97) May 2005 GRUB-INSTALL(8)