ext4.vhdxのある場所の検索。
> (Get-ChildItem "C:\" -recurse -force | Select-Object Fullname,Length | Sort-Object Length -descending )[0..29] 2>$null
最適化
> wsl --shutdown
> diskpart
DISKPART> select vdisk file="C:\Users\onnoyu1012\AppData\Local\Packages\CanonicalGroupLimited.Ubuntu_79rhkp1fndgsc\LocalState\ext4.vhdx"
DISKPART> attach vdisk readonly
DISKPART> compact vdisk
DISKPART> detach vdisk
DISKPART> exit