I have a Philips HDR312 (lifetime sub) with 2x13gig drives that I'm wanting to upgrade. The drives still work fine and the unit has never been hacked. What I'm wanting to do is upgrade the unit with a single 120gb segate that I have laying around. Since this is dual-drive setup, do I need a diffrent image being that I don't want to use the old 13gig drives at all? I want to pack them away for safe keeping. Oh yea, I don't care about the recordings.