I just had windows 8 do a "Drive repair" on my HDD drive (D:). It did the "repair" successfully, and nothing appears to have been lost.
I am worried about what this means. Does this mean that the HDD is failing, or does it just mean that there was a minor glitch? And should I look into backing up and replacing my HDD right now?
I can easily take backups to an external drive right now, so I'm not too afraid if the drive actually fails.
Edit: It looks like I've got a ton of bad sectors now. Drive space has fallen from 750GB to 647GB.