Bought a WD MyDVR Expander drive and connected it to my HR20 (with the power off). When I booted up, my playlist showed 100% available. My 20ish hrs of recordings were gone. I rebooted without the drive and all was back to normal. This has me thinking the DVR booted only to the expander drive. Isn't it supposed to "expand" the current storage? i.e." add onto it"? Or is it supposed to be one drive or the other (other meaning the internal)?. Or is this simply "Operator Error"?! Thanks for any advice!!!