I did not know that. Are you using external esata drives?
Since Oct 2006 or shortly after when eSATA support was originally enabled, I ran out and bought a 500GB drive literally that same week....and I record all my network programming from the OTA versions of the stations...I can literally move the external drive to any of my HR2x dvrs and all the OTA recordings play back fine. Another reason if I'm going to watch series from the networks(CBS, ABC, etc.) I want to record from OTA.