Boot from external HD

elmo elmo at
Fri Mar 14 15:54:37 UTC 2008

elmo wrote:
> This is what I have in /root/grub/menu.lst to boot my ubuntu 
> installation.   It works perfectly.
> --------------------------------------------------------------------
> # Ubuntu installation on /dev/sda2.
> title        Ubuntu 7.10, kernel 2.6.22-14-generic (hda2)
> root        (hd0,1)
> kernel        /boot/vmlinuz-2.6.22-14-generic 
> root=UUID=20f5f8e2-734e-43f4-8cbd-9d9c41ede634 ro quiet splash
> initrd        /boot/initrd.img-2.6.22-14-generic
> savedefault
> boot
> ----------------------------------------------------------------
> I also have a cloned copy of this same ubuntu on a USB external hard 
> drive. 
> Initially it was done to be a backup and possibly for copying to other 
> computers
> but now I would like to be able to boot it and run it from the external 
> drive.
> Since the external drive has a cloned copy, it seems to me that all that 
> has to
> be changed is the 'root' entry from (hd0,1) to whatever .is needed to 
> designate
> the partition on the external hard drive that has the cloned copy...In 
> this case,
> the clone ubuntu is on the second partition of the external drive.
> My understanding is that external USB *__*HDs are SCSI so the 'root'
> entry must somehow indicate that the ubuntu is on the second partition
> on the external HD.
> What should I use for the 'root' entry to accomplish this?
> I should also mention that I have two hard drives installed in the
> computer so the external drive is like a third hard drive.
It looks like my query may be too complicated.

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