I've gotten the Tech Preview from MS and want to play with it on my W8.1 machine without messing anything up. I do NOT want to dual boot. Being that I have a spare HDD what would be the safest way to install W10 to it. Physically detatch my W8.1 drive and attach the spare drive to install W10..........or, attach the spare drive without detaching my W8.1 drive and choose which to boot from through bios at startup?
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