I have comcast but I don't use their dvr. Instead I use my own dvr it is a Hi Def Tivo unit. Comcast just gave me a cable card that goes into the slot of the Tivo unit.
My Tivo DVR is connected wirelessly to my home internet router so I just push a transfer button or set the shows to auto transfer and they go right on to my pc. No discs or anything like that required.
I've had it a couple of years but I think the tivo unit was around $225 but you can get it cheaper now that it has been out a couple of years. I think they have some on amazon for like $80 used. They charge like $12 per month for the tivo service.
This is the unit..
http://www.amazon.com/TiVo-TCD652160-Di ... B000RZDBM2This is the wireless adapter to tap into your home wifi if u have a router...
http://www.amazon.com/TiVo-AG0100-Wirel ... B000ER5G6C