This command shows information about a virtual hard disk image, notably its size, its size on disk, its type and the virtual machines which use it.
For compatibility with earlier versions of VirtualBox, the "showvdiinfo" command is also supported and mapped internally to the "showhdinfo" command.
The disk image must be specified either by its UUID (if the medium
is registered) or by its filename. Registered images can be listed by
VBoxManage list hdds
(see Section 8.4, “VBoxManage list”
for more information). A filename must be specified as valid path, either
as an absolute path or as a relative path starting from the current
directory.