I have a DN 722 receiver that I believe will shortly need a new hard drive. The current one is starting to jump from where you're watching to the end of the recording, not recording a scheduled program, and other "it ain't posed to do dat" errors. I am leaning toward the current drive is going TU:. If anyone has a better theory or fact please post it. Also is it possible to replace the current drive with a larger one (I have a couple of 1Tb WD drives from a now deceased 1.5 Tb raid array)? Any help greatly appreciated !!