Visit The New, Modern Unix Linux Community


GRUB MBR and restoring a partition

 
Thread Tools Search this Thread
Special Forums Hardware Boot Loaders GRUB MBR and restoring a partition
# 1  
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

Previous Thread | Next Thread
Thread Tools Search this Thread
Search this Thread:
Advanced Search

Test Your Knowledge in Computers #803
Difficulty: Medium
The CSS counter-increment property increases or decreases the value of one or more CSS counters.
True or False?

10 More Discussions You Might Find Interesting

1. UNIX for Beginners Questions & Answers

How to boot partition from Grub Minimal_BASH?

Hi, someone knows how can I boot my OS or cdrom from a Grub Minimal_Bash? :confused: sorry, Im a dummy I explain, when I start loading the OS, I get errors, and ends up in the grub bash. This is the minimal_bash and I have no idea of ​​any command. It tells me "unknow partition". The problem is... (0 Replies)
Discussion started by: veravera
0 Replies

2. Hardware

Hard Drives and MBR

Hello everyone. I have a question which I may know the answer to, I'm just looking for a confirmation. When it comes to the MBR of a hard drive, i've read in multiple sources that it's always located in the first sector of the hard drive. Is the MBR there from the factory? When I buy a new blank... (3 Replies)
Discussion started by: Lost in Cyberia
3 Replies

3. Red Hat

Can we specify which grub.conf to use in grub-install.

Hi, Can we specify which grub.conf to use while installing grub on RHEL. We are working on application which requires different grub configurations needed, depending on certain criteria we need to update grub with correct grub.conf. Can we use grub-install for this purpose? (4 Replies)
Discussion started by: successlin
4 Replies

4. Boot Loaders

Lost MBR on disk

trying to recover a lost partition table, where the signature (0x55AA) has been lost, though attempting to restore using a number of tools (fdisk, testdisk et al) the write fails. also the os is unable to read the disk geometry correctly, after attempting to correct the geometry, the updated... (2 Replies)
Discussion started by: xaphan
2 Replies

5. SCO

Backup MBR an Partition Table

hi How can I backup MBR an Partition Table of SCO 5.0.6? (7 Replies)
Discussion started by: ccc
7 Replies

6. UNIX for Dummies Questions & Answers

How to select correct partition and kernel argument for grub?

I use command-line mode of GRUB to load kernel, but I can not know how to chose the partition and kernel argument, as followed : please tell me how to do deal with , thanks! (0 Replies)
Discussion started by: cqlouis
0 Replies

7. Red Hat

Grub Error 17: Cannot mount selected partition.

I dualboot Ubuntu and Fedora in one hard drive. Below are the scenario. First, installed Ubuntu 10.4 on the entire disk (40GiB of size). Then, shrink the Ubuntu installation to equal size to free up space for fedora. Second, installed Fedora 13 using the option "Use free space on selected... (2 Replies)
Discussion started by: etcpasswd
2 Replies

8. Filesystems, Disks and Memory

Creating /boot partition & MBR concerns

I have 40GB HD with mepis8, swap, MBR and under flags word boot. I also have a 160 GB external with a few Linux OS, no swaps, no extended etc. I am total Linux no MS I would feel more secure by resizing that sda1 partition and creating a /boot partition with the MBR housed there. Is that a... (1 Reply)
Discussion started by: worthamtx
1 Replies

9. UNIX for Dummies Questions & Answers

grub problem- keeps rebooting as soon as it tries to do grub

Hi, I installed solaris 10 a few weeks ago. It was working fine during the past two weeks. However, now when I start to load to the drive, I get this problem: The BIOS screen comes up like normal, then screen goes blank and a message "Grub loading stage 2" flashes real quick then the computer... (1 Reply)
Discussion started by: moesays
1 Replies

10. UNIX for Dummies Questions & Answers

How to zero a disk (especially MBR)?

I'm confused. Originally I did telinit 1 cp /dev/sda /dev/sdb where sda is my boot disk and sdb is a USB disk. This probably copied my MBR. Since /dev/sdb is 300GB and /dev/sda only 160GB I had a bunch of space left which I decided to experiment with by creating partitions of various... (1 Reply)
Discussion started by: siegfried
1 Replies
GRUB-INSTALL(8) 							FSF							   GRUB-INSTALL(8)

NAME
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 device.map and grub shell script is strongly advised, e.g. "grub --batch --device-map=target-device.map < 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)

Featured Tech Videos