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Yeah, I'll try the Ethernet cable removal test. I agree that's a great way to isolate internal vs. external influence. Although the fact that all my computers are powered off is almost as good so I think its internal. And I also don't have any devices connected to the USB port and the print server is disabled.My #1 theory is that its the UPnP media refresh service. I noticed that I had it on and set at a shorter interval (5 minutes) than the standby timer (15 minutes). Since the media refresh triggers disk access it explains the occasional drive access in the middle of the night when all computers are unpowered. And it keeps resetting the standby timer so it never goes to sleep.I'll try some different timer combinations to see if I can prove this theory.Maybe the D-Link team can consider deconflicting these two timers since most people probably want the drives to go to standby after a period of no user activity but still want the UPnP media server enabled with periodic directory refreshes. But those refreshes shouldn't happen when the drives are in standby causing the unit to wake up. And the refreshes while the drive is awake shouldn't cause the standby timer to reset.