Legacy master disks rely on magnetic media that degrades over time (bit rot). If a hard drive crashes and the key was not safely moved back to a master disk, that license can be lost forever. 3. Modernizing the License
The designation indicates that this version was part of a coordinated suite of Rockwell products designed to share common services, such as the FactoryTalk Services Platform .
Licenses were physically transferred via a called the Master Disk .