if the win 7 was the original os before upgrading and it was used to justify the win10 upgrade, then according to microsofts license you cannot use it any more.
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Question
Secondary OS to choose at startup
I now have Win 10 on one of my laptop's internal 2.5" HDD. And I've restored to Win 7 (home premium) on my other 2.5" HDD that sometimes is temporarily in the bay of the internal drive that Win 10 is now running on.
With one of those drives in the 2.5" usb HDD enclosure, how can give the Win 10 startup window an optional link that can open and run Win 7 of the plugged in enclosure. IOW, can the startup screen be tweaked so that I can avoid temporarily putting the Win 7 HDD in the internal bay in place of the 2.5" drive that Win 10 runs on (to run Win 7 on the external drive)?
-David
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Answer
I've only found one person that paid for the new 10 license so they could dual boot. Most folk surrender the old Windows license.
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Answer
USB connected drives. It's possible that some 3rd party thing exists to make that possible, but if so, I haven't heard about it. Since it's external, it would likely be slow even if you could get it to work. One thing that might work would be an eSATA connection, since these look to the computer like internal drives. Of course if you get around the technical problems, there are the legal ones others have written about.
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Good luck.
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