I have a LaCie rugged drive that's USB-powered. On my computer, though, I plug it in, and more often than not, it will be up for a minute, make this tiny pop noise, then disconnect and power back up. At work, when I use this drive, it is up for hours at a time with no problems. I'm inclined to think it's my computer, but what could be causing this? I also have to remember to unmount and disconnect before turning off my computer, because if I turn it off altogether, it will spin up, try to turn off, but not and then try to spin back up and turn off repeatedly until I disconnect it.