Tonight I finished the Tivo upgrade.
After spending two hours making sure I was going to enter the correct command, I expanded the Tivo and everything was good. As you can see, I have plenty of storage now.
The thing that freaked me out was that the original 30GB drive literally smoked today. I had it hooked up to the computer. When I powered up the computer with the old drive and the new drive, the old drive smoked. Literally. One of the surface mount chips glowed bright orange in a classic failure mode with smoke.
This made me nervous that I had done something wrong. I guess it was just the old drive commiting suicide when it learned the new drive was working.