Is there a disk diagnostic mode?

I'm pretty sure the disk on my 30G has gone bad. I had the unhappy iPod icon but managed to get it back to where I could restore it. I've tried to reload it, but it only gets about 2G full, then I get error -48.
I've also reformatted it from PC to Mac now. But before I transfer all my music to Mac, is there a disk diagnostic I can run that will look for disk damage? Something that scans the whole drive?

Maybe this will help?
iTunes displays error 69 when syncing iPod.

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