I have 4 physical harddrives, 1 of which is partitioned into 3 drives, so I have 6 harddrives that show up in My Computer. I just recently added another 1TB (WD Caviar Black) and took out one of the IDE drives. This problem has been happening for, I don't know, 4 months now, and it's REALLLLY frustrating. Seemingly Randomly, some of the drives will completely disappear from My Computer. It's usually only 1 at a time, and the reason why I said seemingly is because I think it happens when I plug my phone into my computer. I have a Droid and I've noticed that it's happened twice now when I plug it in and mount it to access the SD card. I thought for a while that it was because I only have a 500W PSU and powering 4 harddrives, 2 optical drives, 5 case fans, a GeForce 8800 GT Superclocked Graphics card, and the rest of the hardware, was overtaxing the power supply. I'm not sure that's the case though. I really hate restarting my computer, but that's the only way I've found to get the drive back without unplugging and replugging it while the computer is on, which I'm terrified to do. Does anyone have a solution to this, other than "don't plug your phone into your computer," because I kinda have to. Please, it's very annoying.