So as we all know...mini does not come with SD menus . Normally I wouldn't care but I am using it on a older HDTV that is 4:3 aspect ratio and I didn't like the letter boxing on all the channels.
I discovered this by accident but if you want the full screen taken up...do this.
Goto settings and goto change resolution. Then goto "test resolutions". When it gets to 420p, hit thumbs up so it confirms that setting, then when it cycles thru 720p and the other settings..DO NOT THUMBS UP them. Just wait till it finishes cycling through. After its done...only 420p should be selected and the tivo will still use the Hd menus but it will now take up the whole screen instead of letter boxing.