[My Tivo is very old SAT-T60 and I must upgrade for reasons mentioned in other threads]
Many TIVO (and other DVRs) quote recording capacity for HD.
I don't care much about HD--or at least I care more about recording more hours.
I assume that I can choose to record SD to get more hours...??
Other question: What is a good conversion factor? For example, if a box says 50 hours HD, can I then (if conversion factor is 4) say that I can use that box to record 200 hours?