So, in short...
1. Install Vista and the Windows 7's. This will also create the ESP partition for UEFI.
2. "Hide" the Vista and Windows 7's OS partitions.
3. Install Windows 8's and 10. This will update the ESP partition for UEFI.
4. "Unhide" Vista and Windows 7's OS partitions.
5. ESP should contain entries for all systems.
Boot manager will be the one from the most recent install, Win 10.
Interesting exercise.
There are countless posts and threads about multibooting, many successes but also many failures...hence, all the "fix your boot partition" tools and programs.
Your steps may ultimately work, only to be undone by some update or reinstall.
When I have to go through these extra steps, it's a sign to me that a different approach should be taken, unless I have the time or attitude to make it a learning experience.
I think I mentioned previously that in this situation, I probably would use two hard drives, with the ability to isolate them (that is, be able to turn one or the other off, so that the computer can only see one drive).
1. Install Vista and the Windows 7's. This will also create the ESP partition for UEFI.
2. "Hide" the Vista and Windows 7's OS partitions.
3. Install Windows 8's and 10. This will update the ESP partition for UEFI.
4. "Unhide" Vista and Windows 7's OS partitions.
5. ESP should contain entries for all systems.
Boot manager will be the one from the most recent install, Win 10.
Interesting exercise.
There are countless posts and threads about multibooting, many successes but also many failures...hence, all the "fix your boot partition" tools and programs.
Your steps may ultimately work, only to be undone by some update or reinstall.
When I have to go through these extra steps, it's a sign to me that a different approach should be taken, unless I have the time or attitude to make it a learning experience.
I think I mentioned previously that in this situation, I probably would use two hard drives, with the ability to isolate them (that is, be able to turn one or the other off, so that the computer can only see one drive).