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How to triple boot, Win 7/Win10/Win10 Insider
I had a triple boot with Win 7/Win 8.1/Win 10 Preview. Each OS on a separate hard drive. I've upgraded my Win 8.1 to Win 10. As it stands, the only way I can boot to the Win 10 Preview is to physically disconnect the Win 10 hard drive. If I point the system to boot from the Win 10 preview drive, with the Win 10 drive connected it boots to Win 10 and not the preview version.
??