Dual boot Win 7/Win 10 problems

I set up a dual boot system with my existing Windows 7 and Windows 10 installed on a separate hard drive. All works fine switching from Windows 7 to Windows 10, but when I reboot from Windows 10 back to Windows 7, lose all USB devices. I'm not sure if this is to do with problems with UEFI and GPT disks (Windows 10 is on a GPT disk. Does anyone have any suggestions how to fix this?


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