HELP! I've recently bought Samsung HX-DU020EC, and I'm having the same problem. When I plugged it in for the first time it worked good, but the next day it couldn't be recognized, so I tried changig the USB port on my laptop over and over it just didn't work. Then I shut down the comuter, turned it on while the HDD was plugged in, the result was the same. Then I tried device management and the drive wasn't recognized even there. So I tried most of the stuff written in the manual and finally it was recognized. Then I formated it thinking that the problem would be solved. But the problem is still here and now it doesn't matter how many times I plug in and plug out the usb, the power cord it can't be recognized.