I've got 4 external HDD's. When playing any m4v file off one of them, I get bad pixilation. Moves on the other 3 drives don't seem to be affected. I've tried about 4 movies and immediately noticed the pixels. I tried the files on 2 Apple TV's, in iTunes and Quicktime. Same thing in all of them. I even tried copying the video file to a different hard drive and the problem followed. Does this mean that the hard drive is shot? Why would the issue follow when copying to a different hard drive? I've attached an example of what I mean.