I rescued a bricked disk drive a few days ago by bypassing its controller and slurping all of its data onto another disk. The disk was a terabyte and made of two platters in such a way that if either failed then the whole thing was effectively dead. Not a good idea.
I've moved to Raid 1 now, where the disk is effectively made of two separate drives, and everything is written to both. That way, if one disk fails, the other one can be used to rebuild a new safety copy. Maybe it sounds paranoid, but its a lot better than losing mad quantities of data. I can remember back two or three years ago when a Terabyte seemed like a lot of data.
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