This command shows information about a medium, notably its size, its size on disk, its type, and the virtual machines which use it.
Note
For compatibility with earlier versions of Oracle VM VirtualBox, the showvdiinfo command is also supported and mapped internally to the showmediuminfo command.
VBoxManage showmediuminfo [disk|dvd|floppy] <uuid|filename>
The medium must be specified either by its UUID, if the medium is registered, or by its filename. Registered images can be listed using VBoxManage list hdds, VBoxManage list dvds, or VBoxManage list floppies, as appropriate. See Section 7.4, “VBoxManage list”.