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Full Discussion: How to copy single partition?
Operating Systems Linux Gentoo How to copy single partition? Post 302085690 by Corona688 on Saturday 19th of August 2006 02:14:55 AM
Old 08-19-2006
Partitions for /dev/sda are going to be like /dev/sda1, /dev/sda2, /dev/sda3, etc. You can copy them too.

The master boot record is outside of all partitions. It is the very, very first sector on the hard drive. You can copy just the boot sector like this:

Code:
dd if=/dev/hda bs=512 count=1 of=bootsector

A corrupt grub can't boot anything. If you can boot windows with grub, then grub is not corrupted, but maybye your partitions are, or grub.conf, and maybye you can't remember which partition number you need etc.

I'd boot the system with some sort of linux livecd to see what's going on with your partitions, and edit your grub.conf if need be.

As for how to restore a selected partition from that giant everything-backup file, I don't know. There doesn't seem to be anything like a loop device for splitting a file into partitions the way linux handles hard drives... I'll do some experimenting and see.

You can restore your boot sector easily, though, if that's the problem.

Code:
dd if=awesome-ginormous-all-in-one-universal-backup-file.img of=/dev/hda bs=512 count=1

Be sure to back it up on a flash drive or something before you do that of course.
Last edited by Corona688; 08-19-2006 at 03:24 AM..
 

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LEARN ABOUT MOJAVE

installgrub

installgrub(1M)                                                                                                                    installgrub(1M)

NAME

       installgrub - install GRUB in a disk partition or a floppy

SYNOPSIS

       /sbin/installgrub [-fm] stage1 stage2 raw-device

       The installgrub command is an -only program. GRUB stands for GRand Unified Bootloader.

       installgrub  installs  GRUB  stage  1  and  stage  2  files on the boot area of a disk partition. If you specify the -m option, installgrub
       installs the stage 1 file on the master boot sector of the disk.

       The installgrub command accepts the following options:

       -f

           Suppresses interaction when overwriting the master boot sector.

       -m

           Installs GRUB stage1 on the master boot sector interactively.

       The installgrub command accepts the following operands:

       stage1

           The name of the GRUB stage 1 file.

       stage2

           The name of the GRUB stage 2 file.

       raw-device

           The name of the device onto which GRUB code is to be installed. It must be a character device that is readable and writable.  For  disk
           devices,  specify  the  slice  where  the  GRUB  menu  file  is  located.  (For Solaris it is the root slice.) For a floppy disk, it is
           /dev/rdiskette.

       Example 1: Installing GRUB on a Hard Disk Slice

       The following command installs GRUB on a system where the root slice is c0d0s0:

       example# /sbin/installgrub /boot/grub/stage1 
                /boot/grub/stage2 /dev/rdsk/c0d0s0

       Example 2: Installing GRUB on a Floppy

       The following command installs GRUB on a formatted floppy:

       example# mount -F pcfs /dev/diskette /mnt
       # mkdir -p /mnt/boot/grub
       # cp /boot/grub/* /mnt/boot/grub
       # umount /mnt
       # cd /boot/grub
       # /sbin/installgrub stage1 stage2 /dev/rdiskette

       /boot/grub

           Directory where GRUB files reside.

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcsu                      |
       +-----------------------------+-----------------------------+
       |Interface Stability          |Evolving                     |
       +-----------------------------+-----------------------------+

       boot(1M), fdisk(1M), fmthard(1M), kernel(1M), attributes(5)

       Installing GRUB on the master boot sector (-m option) overrides any boot manager currently installed on the machine. The system will always
       boot the GRUB in the Solaris partition regardless of which fdisk partition is active.

                                                                    24 May 2005                                                    installgrub(1M)
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