totally agree with Mixture
with the following additional points
the bigger the hard drive, the bigger the potential loss when it goes tits up8.
and the newer the technology, the bigger the risk. 3TB drives haven't really worked through enough into mainstream yet to have overcome teething problems.....remember with Seagates 1TB ones they started failing at around 8 months old, and I seem to remember a similar problem with the first batch of 500GB
the other comment is, it sounds like it's ****ed, but it could be worth trying to attack it with Recuva or a similar program on a 64-bit machine
(question - you say you relocated the disk. You DO have it on a machine with a 64-bit OS don't you....)