How to install Windows 10 on NVMe SSD on old PC? Since old computers don't load NVMe SSD drives when

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If you were to use VirtualBox with Windows 10/11 Home [and a Virtual Hard Disk v2 (VHDX) image,] it would look like this, given VirtualBox for some odd reason doesn't recognize VHDX v2 images yet (even though it's an open specification at this point.)

VirtualBox Example: https://www.virtualbox.org/wiki/Downloads

C:
cd\VirtualBox

C:\Users\username\Desktop>wmic diskdrive list brief
Caption                    DeviceID            Model                      Partitions  Size
xxx xxxxxxxxxxxxxxx        \\.\PHYSICALDRIVE0  xxxxxxxxxxxxxxxxxxxxxxxxx  x           xxxxxxxxxxxxx
xxx xxxxxxxxxxxxxxx        \\.\PHYSICALDRIVE1  xxxxxxxxxxxxxxxxxxxxxxxxx  x           xxxxxxxxxxxxx
xxx xxxxxxxxxxxxxxx        \\.\PHYSICALDRIVE2  xxxxxxxxxxxxxxxxxxxxxxxxx  x           xxxxxxxxxxxxx

VBoxManage internalcommands createrawvmdk -filename \VirtualBox\VMs\Win11_64_adk_imaging.vmdk -rawdisk \\.\PHYSICALDRIVE2
VBoxManage storageattach "Windows 11 (64-bit)" --storagectl "AHCI" --port 0 --device 0 --type hdd --medium \VirtualBox\VMs\Win11_64_adk_imaging.vmdk

VBoxManage internalcommands createrawvmdk -filename \VirtualBox\VMs\USB_DRIVE_WIN_64.vmdk -rawdisk \\.\PHYSICALDRIVE2
VBoxManage storageattach "Windows 10 (64-bit)" --storagectl "AHCI" --port 2 --device 0 --type hdd --medium \VirtualBox\VMs\USB_DRIVE_WIN_64.vmdk

"9.7.1. Using a Raw Host Hard Disk From a Guest" -> https://www.virtualbox.org/manual/ch09.html#rawdisk
"Chapter 8. VBoxManage" -> https://www.virtualbox.org/manual/ch08.html
"WMI Command-line Tools" -> https://docs.microsoft.com/en-us/windows/win32/wmisdk/wmi-command-line-tools

The only caveat with this one, is if anything stops working you have to release the image from the VM in VirtualBox, and recreate it all over again via the console (given it's just a link when operating in RAW access mode.) It's better to dismount it in diskpart like this after you mount it, so the host operating system cannot see it (Windows,) but the guest operating system can still access it (the VM itself.)

PS C:\WINDOWS\system32> diskpart

Microsoft DiskPart version xx.x.xxxxx.xxx

DISKPART> list volume

  Volume ###  Ltr  Label        Fs     Type        Size     Status     Info
  ----------  ---  -----------  -----  ----------  -------  ---------  --------
  Volume 9                             Removable   xxxx MB  Healthy    Offline

DISKPART> select volume 9

Volume 9 is the selected volume.

DISKPART> assign

DiskPart successfully assigned the drive letter or mount point.

DISKPART> automount disable

Automatic mounting of new volumes disabled.

DISKPART> list volume

  Volume ###  Ltr  Label        Fs     Type        Size     Status     Info
  ----------  ---  -----------  -----  ----------  -------  ---------  --------
* Volume 9     F                RAW    Removable   xxxx MB  Healthy

DISKPART> remove letter=f dismount

DiskPart successfully removed the drive letter or mount point.

DiskPart successfully dismounted and offlined the volume.

DISKPART> exit

Leaving DiskPart...
PS C:\WINDOWS\system32>

Good Luck! Happy New Year as well! (Year of the Kitten.)