I've had the worst luck lately with electronic equipment.  My 360 RRoD'd, then the Time-Warner modem started dropping 40% of packets.  Those things got replaced, and now it seems I've lost an external drive.  I've had the thing for several years--4, I think.  It got a lot of heavy use, and it had my main download folder.  It now clicks, spins down, spins back up and clicks again.  I can't access it at all.  Damn it to hell.  Any chance a good whack would unstick whatever is stuck?  Just a thought.
I'm downright paranoid now.  I'm duplicating everything essential and irreplaceable to other physical drives, when I can think of what that may be.  Chances are I'll never catch everything.  Do the MTBF ratings equate to just a few years of continuous use?  God, if this happens to C: or D:, I'm really screwed.  My backup PC died catastrophically last year.  *Sigh*