jimmyone wrote:I think you may have missed this one. It's as much info as you need about the amount of space remaining
6) No way to know how much space is left on the DVR.
Try Options/
System Options
System Info
System Resources
Disk Usage
Thanks Jimmyone...I was just going to type this for Cygnus, the OP.
Just know that the disk usage is given as a PERCENTAGE...so AT&T wants you to do a little math to convert to hours 
The number of "hours" left also depends on the quality of the video...SD or HD.
Scott