linux – Deleting an apparently unused VirtualBox Snapshot

The proper procedure would be to release, then remove the disk snapshot. The release operation will remove the disk from the VM. Therefore, you will need to add the disk back to the VM after deleting the disk snapshot.

An Example

Below I have my VM named Machine. There are no VM snapshots for the Machine VM.

Select Media as shown below.

Select Release, as shown below. However, if the snapshot does not appear, then you can ignore the rest of this answer and just use your file manager to delete the snapshot.

Again, select Release, as shown below.

Select Remove, as shown below.

Again, select Remove, as shown below.

Select Delete, as shown below.

The result is shown below.

Select Machines, as shown below.

Below you can see the SATA disk has be removed from the Machine VM.

You will need to add this disk back in. Goto to settings to do this. Selecting this disk is shown below.

Below shows the Machine VM with the SATA disk.