I recently replaced 6 or 7 Fujitsu 30GB drives for Rob Schofield. It seems returning dead hard drives is a lot easier if you're in the US.

Every one of them had a good warranty (3 year) and were replaced promptly. Use this link to see if your drive is still able to be returned for replacement.

EDIT: I am assuming your drive is Fujitsu. I think all Mk2a 30GB models were equipped with Fujitsu drives. If it's IBM, those have the same warranty.