On the same box I have a hdd with win 7 & a hdd with win 10. Can I get the win 7 to detect that I've added a win 10 disk.

I installed the win 10 while using that box, but the 1st disk wasn't attached.


Boot into Windows 7 and use EasyBCD to add a new boot menu entry for Windows 10:


(Under Type most likely Windows 10 will not be listed, but selecting Windows 8 should work.)

I would recommend however that you make the Windows 10 drive the first boot device and add a Windows 7 entry to its boot menu instead.

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  • This worked for adding an entry, it was misnamed, but would not boot. I'm going to work on it a bit – wlraider70 May 22 '15 at 2:53

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