How to install two Windows OS's in same PC?

Have you tried disabling Windows fast startup by running:
powercfg -h off

in each OS?

To hide the Windows 10 install drive in Windows 11, just right click on the Windows 10 partition in disk manager when booted into Windows 11, select the option to change drive letter, and select no drive letter. Or you can run:

Code:

diskpart
select volume x  <- replace x with the letter that the Windows 10 partition is assigned
remove
exit
exit

NavyLCDR said:

Have you tried disabling Windows fast startup by running:
powercfg -h off

in each OS?

To hide the Windows 10 install drive in Windows 11, just right click on the Windows 10 partition in disk manager when booted into Windows 11, select the option to change drive letter, and select no drive letter. Or you can run:

Code:

diskpart
select volume x  <- replace x with the letter that the Windows 10 partition is assigned
remove
exit
exit

Hi Navy, after running powercfg -h off in cmd as Administrator in each OS the dual boot menu now shows up after each OS restart without the need of powering off/on. That fixed it, thanks!
I also removed the letter assignment to the partition as you suggested and now the W10 install drive is hidden within W11 file explorer. Could that also had been achieved by disabling the drive from Device Manager? And does hiding the other OS drive within each OS effectively isolate it like in a sandbox, meaning that whatever I install in one OS (updates, apps, etc) will not affect the other OS? Thanks

It is correct that whatever you install in one OS will not affect the other - but that is also generally true whether the other OS is visible with a drive letter or not.

You could disable the physical drive in drive manager if you wanted. I don't see much benefit (nor harm) in doing it that way, though.

What kind of tweaks can I make to the dual boot menu, I mean for example: how to change the timeout (currently 30sec), I also read about changing the default OS within msconfig, what effect does being "default" have?

Default is the OS that will load if you don't click anything and let the timeout expire. You can change the timeout on the boot tab of the msconfig menu (the same place you can set the default OS):

Thanks Navy, that was easy!. msconfig can be run from within either OS for those settings to be applied?

antares said:

Thanks Navy, that was easy!. msconfig can be run from within either OS for those settings to be applied?

Yes. It operates on the bcd that the OS was loaded by.

NavyLCDR said:

Yes. It operates on the bcd that the OS was loaded by.

I will have to learn about bcd, that is a whole different chapter. I'll test later the change, adjusted now to 60sec and changed Win10 to default (W11 was set as default). Will let it timeout to see if it boots into W10. Regards

I will also try in the future the VHDX roadmap suggested by Jimbo

60 seconds will seem like an eternity. I set my dual boot menus to 3 seconds!

NavyLCDR said:

60 seconds will seem like an eternity. I set my dual boot menus to 3 seconds!

You don't have to stare at the screen waiting , you can always click on your OS choice to boot