I ran HDTune to check its performance and noticed the transfer rates are all over the place. The drive is not used for the system OS and only used for multimedia content.
Whats also worrying is that the drive has been making a strange noise, almost like its parking the head or similar. It's very sporadic and happens maybe once every couple of minutes.
Here's a video (click to view)
SMART reports the drive as being 100% fine.
Edited by Pazz - 9/2/12 at 12:31pm