Tivo HD - any way to tell how much time remains on drive?

There's a setting in 'information' that says 34 HD hours or 290 SD hours, but what I'm looking for is a real-life reading of either how much time or hard drive space remains, in a percentage for example.

Is there some way to see those numbers? I do a lot of recording off late-night, OTA old 4x3 shows (Avengers, Time Tunnel, etc) and am not quite sure if these are registering as SD or HD shows.

On Roamio's and Premieres is gives a percentage of drive space left, but on the HD, I can't find...

Tivo HD - any way to tell how much time remains on drive?

Tivo HD - any way to tell how much time remains on drive?