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Creating virtual hard disk (VHD) for WSL2
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vhd4wsl2.md

Creating additional virtual hard disk (VHDX) for WSL2 with ext4 filesystem

Lines starting with # mean the commands have to be executed by root user under Linux shell (WSL distro). All other commands have to be executed under Windows-PowerShell as Administrator.

Make VHDX disk file and mount it under Windows

New-VHD support.vhdx -SizeBytes 25GB -Dynamic -BlockSizeBytes 1MB
Write-Output "\\.\PhysicalDrive$((Mount-VHD -Path support.vhdx -PassThru | Get-Disk).Number)"

Tip: Open "Computer Management" GUI program, then navigate to "Storage/Disk Management" and U can see all the drives attached to Windows. The new virtual disk should also be there.

Note the drive name and mount it for WSL

wsl --mount \\.\PhysicalDriveX --bare

Enter your WSL distribution and note the device name (using one, or better: all the commands)

# lsblk
# dmesg
# fdisk -l

Create a partition on the device, format it with ext4 filesystem and mount it

# fdisk /dev/sdX

Using above tool create GPT partition table and one (or more) partition(s). Write all changes and quit. Then format the partition and mount it somewhere:

# mkfs.ext4 -G 4096 /dev/sdX1
# mkdir ~/support 
# mount /dev/sdX1 ~/support

Done.

To unmount

# unmount ~/support

wsl --unmount \\.\PhysicalDriveX

To detach it completely (eg. if you want to (re)move the file)

Dismount-VHD support.vhdx

Happy WSL!

References & sources

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