I have a secondary hard drive, 2TB western digital caviar, that has been giving me issues lately. The drive will occasionally have corrupt data on it and programs will be unable to write to it. This fixes itself with a scan and repair through Windows, but it has been happening more often, almost every day this week. It's a relatively new drive, less than 3 years old. I'm running windows 8 64 bit.
UPDATE: The tool from WD couldn't fully evaluate my drive. It said that there are too many bad sectors. Guess I'll have to check with WD support to see what can be done about it. Right now I'm backing up what data I can fit on my primary drive. The rest I'll just have to replace later.
Another update: The drive is going to be replaced by WD free of charge. I lost a lot of games and music, but I can get it back once I get the space.