I cloned my windows 7 ssd then I did the free upgraded from windows 7 to windows 10 - with data hard drives disconnected. I connected the other hard drives and played windows 10. I swapped out the windows 10 hard drive with the clone of windows 7, then downloaded something to one of the data hard drives (E. I put the windows 10 hard drive back into the computer. The files that I downloaded under windows 7 did not show in windows 10. I put in the window 7 hard drive back into the computer and the files show up.