OK, more likely that it hiccuped.
1. http://storagemojo.com/2007/09/19/cerns-data-corruption-research/
2. http://www.cnet.com/forums/discussions/hdd-reliabilty-for-2014-is-out-scary-634896/
3. http://en.community.dell.com/support-forums/laptop/f/3518/t/19463826
I'm going to call the HDD unreliable. Just last month I ran into such a drive and for under 50 for a laptop 500GB NEW HDD we cloned the drive (less work!) and the odd errors went away.
Was watching a video when video started glitching so I shut it off, computer flickered and froze. I shut down , Tried to restart computer and it said Windows failed to start., asked to "Launch Start up Repair or Start Normally. Neither worked, Ran diagnostics and came back with Error Code 2000-0142, showing bad hard drive. Tried to boot from my Windows Re-install/Repair CD. Could not find Windows 7 to repair. Decided to try Complete Reinstall and it worked. Has anyone heard of a virus or Trojan that can do this? Delete your Windows so it won't launch. I lost all my file my children's pictures, movies, everything.

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