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

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  1. NavyLCDR's Avatar
    Posts : 16,779
    Windows 11 Pro
       #11

    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
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  2. Posts : 163
    Windows 10x64 Pro
    Thread Starter
       #12

    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
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  3. NavyLCDR's Avatar
    Posts : 16,779
    Windows 11 Pro
       #13

    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.
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  4. Posts : 163
    Windows 10x64 Pro
    Thread Starter
       #14

    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?
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  5. NavyLCDR's Avatar
    Posts : 16,779
    Windows 11 Pro
       #15

    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):

    How to install two Windows OS's in same PC?-capture1.jpg
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  6. Posts : 163
    Windows 10x64 Pro
    Thread Starter
       #16

    Thanks Navy, that was easy!. msconfig can be run from within either OS for those settings to be applied?
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  7. NavyLCDR's Avatar
    Posts : 16,779
    Windows 11 Pro
       #17

    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.
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  8. Posts : 163
    Windows 10x64 Pro
    Thread Starter
       #18

    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
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  9. NavyLCDR's Avatar
    Posts : 16,779
    Windows 11 Pro
       #19

    60 seconds will seem like an eternity. I set my dual boot menus to 3 seconds!
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  10. Posts : 163
    Windows 10x64 Pro
    Thread Starter
       #20

    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
      My Computer


 

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