docs/operations/reference/powershell/hyper-v/delete-locked-vhdx-file.md

Purpose: You may find that you cannot delete a VHDX file for a virtual machine you removed from Hyper-V and/or Hyper-V Failover Cluster, and either cannot afford to, or do not want to reboot your virtualization host(s) to unlock the file locked by SYSTEM.

Run the following commands to unlock the file and delete it:

Dismount-VHD -Path "C:\Path\To\Disk.vhdx" -ErrorAction SilentlyContinue
Remove-Item -Path "C:\Path\To\Disk.vhdx" -Force