Recently I notice my Tivo usage under "My Shows" never went above 92% evening after a bunch of show was recorded and thought it was odd that it stayed at 92% for several days. I believe it's actually now at 100% as I notice some earlier shows is now missing. Just deleted 7hrs of HD and it dropped to 91%.
Not sure what's going on but I did get the latest update and the weeks after Hurricane Sandy I had to power off and on the unit while running on a generator.
This is for a Tivo Premiere with an upgraded 2GB drive that have been running great for a while now.