I have two external Maxtor One Touch drives (500 gig and 750 gig)I use with my 622. I can record on either, but cannot play back directly from either without pauses and glitches. I can reload to the internal drive ok and play back from there but that's a pain. I want to buy a new drive and would like one that can playback directly without glitches. Suggestions on current models that have worked for you ?