could be a power issue. do you have all these drives plugged in at once? how many watts do they use, and how much is available from the power supply?
i never thought of that stuff before, but it can make a difference (if you occasionally get hardware that doesn't start at boot, this is probably your problem - like my CD burner occasionally doesn't start, or one of the encoder-cards at work doesn't work after a while, etc).
try unplug a few things you don't immediately need and try again. if that solves the problem, then either drop a new power supply into your computer that can handle the load, or simply unplug a few peripherals (USB can be a massive drain, so an external powered hub could be useful to you - it certainly helped me).
i could be completely off the mark though. maybe the Ring explanation is a better one (i've gotta see it one of these days, but Ju-On was pretty boring, so i'm in no hurry).