I've just found a few hard drives, they are branded by a major company and are compatable in the ps3. Its only <$10 or so more expensive, but the hard drive will have less chance of failure, better speeds, etc. I heard the 3.56 made HDD upgrading not possible, you might want to look to that if you are on 3.56.
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Edit: The Segate drive (first link) has 16mb of cache, it might increase speeds somewhat, but it wouldn't be very noticeable in a PS3.
Hope I helped.