Don't know if this has been posted, but I've been having issues with my hard drive stuttering (audio primarily) and video (freezing occasionally). After a call to tech support, they provided me with the steps to defrag the internal hard drive. It is non-destructive up to the point that if it finds a file (i.e. show) that has bad sectors, etc...that is the only thing that will be deleted unlike previous methods of reformatting the entire drive. They said it would take about 90 minutes so - be forewarned. 1. Depress reset button next to access card. 2. When "Almost There" message appears on screen: press down arrow and record button ON DVR (not the remote) simultaneously until message appears on screen then release. 3. Defrag could take up to ninety minutes and again, the only items deleted will be those with problems.