Some video frames show up in the middle of others videos

[yardline]

So I have a second drive just for video, with a bunch of different .avi and mpeg files. I had a few I hadn't watched in a while and when I started to view them every so often there will be a few frames of other videos from the same disk interspersed in the middle. In other words when I'm watching video A, small pieices of video B and C are mixed in. I ran CheckDisk on the drive but it didn't help. Any idea how this happened or how to avoid it in the future?

[hudsonf]

I had a WD 200GB drive that would do the same thing. After a while the drive started clicking than died. I don't know why but it only did this if I copied a dvd to it with DVDShrink.