There will always be some compression involved since it is recorded as mpeg2 video. You can hack the unit to install TivoWebPlus and then change the resolution to 720x480 at best quality. You may not necessarily see a drastic change in quality since there will always be some degradation with respect to the original source video, especially if it originated from a digital source like DirecTV or Dish. Your best bet would be to get a newer HDTivo to record and playback all of your HD shows in Hi-Def.