This command sets, gets, or deletes a medium property. The syntax is as follows:
VBoxManage mediumproperty [disk|dvd|floppy] set <uuid|filename>
<property> <value>Use
<disk|dvd|floppy>to optionally specify the type of medium: disk (hard drive), dvd, or floppy.Use
<uuid|filename>to supply either the UUID or absolute path of the medium or image.Use
<property>to supply the name of the property.Use
<value>to supply the property value.
VBoxManage mediumproperty [disk|dvd|floppy] get <uuid|filename>
<property>Use
<disk|dvd|floppy>to optionally specify the type of medium: disk (hard drive), dvd, or floppy.Use
<uuid|filename>to supply either the UUID or absolute path of the medium or image.Use
<property>to supply the name of the property.
VBoxManage mediumproperty [disk|dvd|floppy] delete <uuid|filename>
<property>Use
<disk|dvd|floppy>to optionally specify the type of medium: disk (hard drive), dvd, or floppy.Use
<uuid|filename>to supply either the UUID or absolute path of the medium or image.Use
<property>to supply the name of the property.

