Cox → Cox Trio DVR -- used/free space

Greetings, I have the Cox Trio DVR and am seeing only 92% of recording space marked as used or free. The other 8% is represented in a green block with no label. So on my DVR screen, the "used/unused space" bar basically looks like this:

[ (green) | --- 38% --- | ----- 54% used ----- ]

Does anyone know what that "green" section represents? What's accounting for that other 8%?

Thank you!

These are programs you have chosen to save until manually erased.

They will also show with green dots instead of orange dots next to the program in the DVR list.

That makes perfect sense. Thank you!