I have a hard drive from an xbox, could i use it in another xbox that is unmodded??

nope.

surely there must be some way to unlock it?

There is away to unlock it, but to
my knowledge if your xbox is not
modded it won't pickup the drive.

if you want to exchange hard-drive or upgrade hard-drive without using a modchips, then you will need to find your epprom key and the easiest way to get that without open up your xbox is to use the gamesave expliot...

so therefore, it seems like you need to do some sort of softmod job in either ways :D

Answr:Why Not, r u on msn m8? if so could u add me or email me please, u seem to have a lot of knowledge about this and would like to ask u a few questions if u dont mind

msn/email mcunni1817@blueyonder.co.uk