BT4 Kernel Panic Error

[jawatech]

I am trying to install BackTrack4 on an external USB Hard drive. It is the only drive connected. I have followed the manual installation instructions from the
offensive-security walk through, and everything went smoothly. No hang ups at all, but when i reboot and remove the live disk, i keep getting this error:

Kernel Panic - Not syncing vfs: unable to mount root fs on unknown-block(8,3)

What would cause this?

[bluerose]

Got same problem.
When i'm installing my bt4 on external drive it's in dev as /dev/sda{1,2,3},
but after reboot - same external drive is at /dev/sdb{1,2,3},
and its make that kernel panic.

U need to know your drive name after reboot, and make it same when lunching lilo.
It solve the problem ;-) (in most cases)

My question: how to change /dev/sda to /dev/sdb during system running?

Greets,
bluerose

P.S. Sorry for my eng.

Edit: I've google it, and found a solution for my problem:
ubuntuforums(dot)org(slash)showthread.php?t=966665
and folowing:
www(dot)reactivated(dot)net(slash)writing_udev_rul es(dot)html

but this not solving all problem, when U R using ssd :-/

(change links - im not allowed to put URLs here ;P )