Hi Sylvia - the external seagate drive is samsung drive says model SRD0SD1
I do not have another USB 3 drive to test, but all my other devices, which are USB2 , including drives, do not cause the problem when plugged into the USB Ports (whether plugged into the USB 2 ports or USB 3 ports) . And when this device is plugged into a USB 2 port it does not cause a problem. And when this device is plugged into the USB 3 port AFTER the computer has booted, it does not cause the problem.
It is only when this device is plugged into a USB 3 port prior to boot, that the computer hangs on startup.
