I used a Kill-A-Watt power meter to measure the power usage of my HR23. It used 23-25 watts no matter if it was OFF, ON, SD RECORDING, HD RECORDING. My old Replaytv would power down the hard drive and park it when it was off (standby) and only use 5 watt. Why bother to turn it off? I can only guess that "live buffering" is turn off when the actual DVR power is off this saving wear and tear on the hard drive. Correct?