If you want more than 75 HD hours of recording, you can drop almost any drive up to 3TB into the Roamio and it will work. You will have to repair any cable cards and go thru guided setup again. The best drives to put in them are the Western Digital AVGP drives. I put a WD30EURX 3Tb in one of my Basics and just put another one in the OTA yesterday. Now 450hr of HD recording time
. I have a WD20EURX 2TB sitting on my desk to put in one of the other Basics.
Once football season is over, I will put Dish on pause and go back to OTA only and just the Tivo's and Mini's.
FYI if anyone wants a refurb OTA for parts or extra remotes, power supply or even to use on a monthly service plan. Woot has them for $25. 2 days left or until out of stock. I bought 3 roamio basics as refurbs from woot earlier this year and they have been fine. Looked and operated like new.
http://electronics.woot.com/offers/tivo-roamio-ota-digital-video-recorder-10