And, according to Storage Review, IBM has made available a fix for the 75GXP and 60GXP hard drives.
These drives, apparently, fouled up when the heads were idle, and as we all know, Old Nick makes work for idle heads.
You can find more details at Storage Review and on this page. µ
See Also
IBM: Don't power hard drive over eight hours a day
IBM reduces warranty on hard drives soon
IBM rebuts 120GXP problem