7.18. VBoxManage closemedium

This command removes a hard disk, DVD, or floppy image from a Oracle VM VirtualBox media registry.

VBoxManage closemedium      [disk|dvd|floppy] <uuid|filename>
                            [--delete]

Optionally, you can request that the image be deleted. You will get appropriate diagnostics that the deletion failed, however the image will become unregistered in any case.