I’m pretty comfortable with computers and replacing hard drives. I’m also comfortable with burning CDs. If this neither describes you nor anyone you know, then you may just want to skip this.
About 3 years ago I bought a TiVo with a lifetime subscription (possibly one of the best moves in my life!)
You may or may not know that such a subscription is NOT transferable to any other TiVo, so it makes my box somewhat precious.
OK, 2 years ago I checked out this addon kit from http://www.weaknees.com which added 160gb to my 40gb for a total of 200gb.