I recently bought a UGreen SATA to USB adapter and tried two hard disks. Both had the same result. When I attached them, they both showed as USB Drive G and upon opening the drive an error message pops up and says "Please insert a disk into drive (G". The drives work so I don't think it's the drives, I installed them in the PC and they showed up and worked just fine. The adapter is a USB 3.0, but I've read that 3.0 can work on 2.0 ports at the loss of speed in data transfer. I'm at a loss and don't know what to do. Help would be much appreciated!