All the drives are connected by a data cable.
I bought a 32 gigabyte flash drive to experiment with, the 8 gig I already have didn't have a problem on either 7 or 10. I put some of my files, some of the same ones I put on the backup drive but can't see, and then I tried to put them on the backup drive while in 10 and it says they are already on the drive. For some reason I can't see or access them in 10.