(pssst..)@moderators: if you consider this sorta advertising and / or violation of TOS, please do remove.
Hitachi drives are totally unreliable. They're all based on the IBM Deathstar line (since Hitachi bought the division and technology from IBM), so that should tell you all you need to know.
Besides, I'd rather have a couple of Western Digital Caviar 250gb drives before one 400gb Hitachi. I can get the WD drive for $140 at circuity city and they're uber-quiet, fast, and extremely reliable.-rt