It should detect the data on the external drive using the USB on the side of the Xbox. If you haven't already done a factory rest it as it won't affect the external device.
And could i know what you...

Good good

https://www.tenforums.com/attachments/virtualization/109400d1478692451-hyper-v-machines-stopped-working-2016_11_09_11_54_132.png

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My Windows 10 virtual machines worked fine. But today when I attempt to start the machines I get the error '(machine name)' failed to start. and '(machine name)' could not initialize. The same thing...

This could be down to your in game settings locked it at that

You could have a high amount of pressure on your CPU such as chrome and other apps open at the same time

you should be able to change the games stored data to the external device not the internal hard drive.

This happend to me try changing your resultion

If you are running on full screen try using the windows key that should sort it out. If not Ctrl+Alt+Delete Followed by task manager.