Windows 8.1 does not detect two My Book 4TB drives at the same time

I just bought two My Book 4 TB drives but Windows 8.1 will not recognize both drives if they are both connected at the same time.  They are both recognized if I only connect one drive but when I try to connect both drives only one is recognized.  Disk Managment does not show both drives and only one drive is assigned a drive letter.  I have tried to change the drive letter to a different drive letter but that doesn’t help either.  Running a Dell XPS 8300 desktop computer.


This is a well-known Microsoft Windows issue known as Signature Collision. Please visit the following link for additional information and possible resolution steps:

1 Like

Such an easy solution to my problem.  Thank you very much for pointing me in the right direction!