UML Modeling Techniques > System architecture modeling > Key items > Disk
  
Disk
A disk is a mass storage device attached to the system.
Use the icon on the System Architecture Diagram toolbar to add a disk to the diagram, or you can drag and drop a disk from the dictionary.
When you have added a disk, you can change it both via the diagram using the disk Property pages and the context menu.
To describe its size and speed, you attach a disk type to the new disk through the Options tab of the disk's Property pages.
Use the icon on the System Architecture Diagram tool bar to link items to a disk.