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Basically there are two different types of recorders (1) PVR/DVR and (2) a DVDR. There are many variations of PVR - most only recording FTA TV, others only pay TV, a few recording both and a few with external inputs like a VCR. The [http://www.dtvforum.info/index.php/topic/161206-the-basics-of-digital-pvrs-dvdrs-for-beginners/ DTV Forum Essay on Digital Pvrs and Dvdrs] explains the differences as well as touching on Subscription Free Digital Video Recorders.