I purchased a second 2 TB My Passport drive to back up my primary one. However, my computer will not access both drives at the same time. Individually, they work just fine, but as soon as I plug a second one in, it won’t access it. It doesn’t assign a drive letter to the second drive, and I can’t get into it. I can, however, see the second drive (no drive letter assigned) on the “safely remove USB device” section.
When I plug a second USB drive in (not WD brand) the system works properly.
Using Windows 7