Either the drive or the cable. The latter is easy enough to swap out. For the former, I'd suggest getting all your data off, and writing some character (like a zero) to the entire disk using dd. That will force bad sector relocation. Then reinstall.
I had to do that a few years ago when I had a bad cable for a while. After getting the bad sectors mapped out, it has worked fine.
Now the disk might be toast, and you have to replace it. BTW, what does the bad sector count show in smartctl? If it is growing, you have troubles.
Correction: not the bad section info, but the error rate.
Last edited by DrJ; 13th July 2008 at 04:03 PM.
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