Not happy with your DVR recording device that costs a lot of money? Do what lightrunner, from tivocommunity did, and open it up and begin tweaking. He initially wanted 2TB of storage, but ended up with 1TB—oh well.
I was disappointed to find out that the eSata port on the new S3 was not yet active. So like the Glad Press n Seal, I decided to take matters into my own hands and increase the S3 recording capacity the old fashion way.
This guy obviously knows what he is doing, but I still wouldn't recommend this to any average Joe. Bricking a S3 Tivo would be a heartbreaker.
Tivo S3 upgraded to 1TB via external RAID [tivocommunity]