Install 2 Win 10 installations on 1 disk drive.

steve17

Member
Local time
3:57 PM
Posts
2
I have the iso for Win10 build 19043.1237 on a USB flash drive and I have a Win11 ready motherboard. For testing, I've installed Win10 multiple times on various disk drives and upgraded some of them to Win11.

Now I want to install Win10 twice on one disk drive. I plan on upgrading one of them to Win11. Has anyone installed Win10 on 2 different partitions on a disk drive? I've done it, but now the second installation boots up only. I expected an OS selection screen allowing me to chose which OS I want.

I've gotten such a screen when I installed Win10 on another disk. The installer made the other disk non-bootable and gave me the OS selection screen on the first disk. But I want to put 2 OS installations on one disk and get the OS selection screen.
 
Windows Build/Version
Win10 19043.1237

My Computer

System One

  • Operating System
    Windows11
    Computer type
    PC/Desktop
    Manufacturer/Model
    ASrock extreme wifi 6e mobo
    CPU
    Intel core 7 gen 11
    Motherboard
    ASrock extreme wifi 6e
    Memory
    32 GB
    Graphics Card(s)
    none
    Sound Card
    none
    Monitor(s) Displays
    1 Samsung
    Hard Drives
    Several now for testing.

NavyLCDR

Well-known member
Power User
VIP
Local time
12:57 PM
Posts
310
When you are booted into one Windows installation, the other Windows partition should have a drive letter. If it does not, then simply assign it a drive letter. Let's say it is X: drive. The command to add it to dual boot would be:

Code:
bcdboot X:\Windows /d /addlast
 

My Computers

System One System Two

  • Operating System
    Windows 11
    Computer type
    PC/Desktop
    Manufacturer/Model
    Homebuilt
    CPU
    AMD Ryzen 7 3800XT
    Motherboard
    ASUS ROG Crosshair VII Hero (WiFi)
    Memory
    32GB
    Graphics Card(s)
    EVGA GeForce GTX 1080 Ti
  • Operating System
    Windows 11 Education
    Computer type
    Laptop
    Manufacturer/Model
    Dell Inspiron 7773
    CPU
    Intel i7-8550U
    Memory
    32GB
    Graphics card(s)
    Nvidia Geforce MX150
    Sound Card
    Realtek
    Monitor(s) Displays
    17"
    Screen Resolution
    1920 x 1080
    Hard Drives
    Toshiba 512GB NVMe SSD
    SK Hynix 512GB SATA SSD
    Internet Speed
    Fast!

steve17

Member
Thread Starter
Local time
3:57 PM
Posts
2
Thanks for the reply. Actually I just remembered I failed to disable fast boot, which I do by shutting off hibernate. Now it's working, and I'm embarrassed. But I'm old so I have an excuse. ;)
 

My Computer

System One

  • Operating System
    Windows11
    Computer type
    PC/Desktop
    Manufacturer/Model
    ASrock extreme wifi 6e mobo
    CPU
    Intel core 7 gen 11
    Motherboard
    ASrock extreme wifi 6e
    Memory
    32 GB
    Graphics Card(s)
    none
    Sound Card
    none
    Monitor(s) Displays
    1 Samsung
    Hard Drives
    Several now for testing.
Top Bottom