I have a 2tb usb3 my book attached to the usb3 port on the back of my pc. I have just bought a 2tb usb3 my passport but when I connect that to the other usb3 port on the back of the pc both the my book and my passport disappear! I have tried changing the drive signatures for both drives but still as soon as I plug in either the my book or my passport they both disappear. If I plug one of them into a usb2 port I can see both drives.
Please can any help?