see also: VirtualBox 🇩🇪
chattr -R +C ./VirtualBox VMs/
sdelete -z C:
VBoxManage modifyhd somedisk.vdi –compact
VBoxManage modifymedium disk {938781e0-65f5-46de-a656-8118cf761cdb} –compact
.vbox
File in the VM folder in VirtualBox VMs
could be empty or inaccessible, maybe rename .vbox-prev
file to .vbox
to fix.