The PhysicalMedia class represents any type of documentation or storage medium, such as tapes, CDROMs, etc. This class is typically used to locate and manage Removable Media (versus Media sealed with the MediaAccessDevice, as a single Package, as is the case with hard disks). However, 'sealed' Media can also be modeled using this class, where the Media would then be associated with the PhysicalPackage using the PackagedComponent relationship.