There's a code that you can enter to delete *everything* even the information from the guide. So it will take 15-30 minutes to re-download like there was a power surge. To delete it, follow these steps:
With your remote
Press "replay" one time ( the arrow bending back )
Press "MY DVR" three times ( button next to replay)
Press "LIVE" one time ( button next to MY DVR)

Your box will shut down and do all sorts of junk. Let it sit a minute then turn it back on.
More information: »Clearing out your DVR

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by Lostintech