I got my DX4000 when they first shipped. As long as I have it, the drive lights on the front have blinked about every second or so.
I have always presumed this was normal/ok, but figured I would ask.
It concerns me that the drives are essentially always being accessed and never go into any kind of power saving mode to extend life/save power.
Oh, and the darn bblue light light up the entire room in the evening!