I'm dual booting two windows 10, bootgmr issue

In response to post #9
Dude, that post from 2015.........

I have just been researching dual booting & it works good for 1 drive, as that menu comes up just before the default windows loads up but you can then change the default partition to load up by opening "msconfig" & saving you default choice.

As for 2 drive dual boot you would really have to be legacy install like i used to have before I 1st purchased a Uefi mobo, but again I used power switching to turn drives off.

So if you do it like this you would have to keep removing the drive you do not want to boot then do a bios default reset for it to boot the other drive which is awkward & that is what I keep having to do to load my external boot backup drive for erasing drives which also override the Uefi protection on the non booted Uefi disk.
This would become anoying if you did this every day...

My suggestion is keep the biggest drive for files & create dual boot on your smaller drive or newest ? otherwise you will be stuck like I said I think

RoadBlaster said:

I have just been researching dual booting & it works good for 1 drive, as that menu comes up just before the default windows loads up but you can then change the default partition to load up by opening "msconfig" & saving you default choice.

As for 2 drive dual boot you would really have to be legacy install like i used to have before I 1st purchased a Uefi mobo, but again I used power switching to turn drives off.

So if you do it like this you would have to keep removing the drive you do not want to boot then do a bios default reset for it to boot the other drive which is awkward & that is what I keep having to do to load my external boot backup drive for erasing drives which also override the Uefi protection on the non booted Uefi disk.
This would become anoying if you did this every day...

My suggestion is keep the biggest drive for files & create dual boot on your smaller drive or newest ? otherwise you will be stuck like I said I think

He doesn't want dual boot but got it anyway by what could be an accident during installation of windows on one drive while the other one was connected. That can end up with OS mixing boot and system partitions between 2 drives. In such case you can end up with proper mess in which you can't boot from one drive if other is not present.
By now I would already loose my patience, picked out all private files (if any) from new disk, removed second one and reinstalled windows.
After that, second drive can be safely reinstalled and cleaned out of all unnecessary windows partitions and files. Better yet, I would back up files from second drive and reformatted it and return only necessary files to it.
That's how I have triple boot with 3 drives, W1909, fast insider build and a Linux. When booting from either of two windows drives (both are SSDs) I have BOOT menu to choose OS made by EasyBCD (it's easier that way).

NavyLCDR said:

You can dual or more boot multiple drives in UEFI mode from a single boot menu on a single drive. What makes you think that you can't?

And the OP's system is legacy, plus he doesn't want to dual boot anyway.

Well the comment was not for you but in general but for the thread starter & other readers, just explaining for people who do not know much about dual booting, as people do read threads without joining the forum right ? thats how I learnt alot of info.

NavyLCDR said:

You wrote,


And that is not true. You can dual or triple or quadruple boot from multiple physical drives from a single EFI system partition on a single drive in UEFI mode. What makes you think that is only possible in legacy mode?

I can not do it from my system like that, if I use multiple drives I would really prefer power switching method to save drive wear from being on & not used as makes no sense to use multiple drives when 1 drive can handle it.

Also, so far you method has not worked on this thread ?

One more thing:

Most people have a m.2 drive these days & not older ssd/hdd setups & at most like I am planning for 2 x m.2 1TB drives were one of them is multiple boot drive, new cases do not even have multiple drive slots anymore so it's just not practicle to have multiple drives for booting.

Since CSM is now call emulation what happens in 10 years time will legacy be no more ?

RoadBlaster said:

I can not do it from my system like that, if I use multiple drives I would really prefer power switching method to save drive wear from being on & not used as makes no sense to use multiple drives when 1 drive can handle it.

Also, so far you method has not worked on this thread ?

You get more physical wear and tear by physically switching drives than from letting them run all the time, more accidents happen from dropping drives. Besides, when you have all drives running you can share files between them or fix problems on each one.
If your BIOS allows it, it's better to just disable unwanted drives.