Storage Layer
The Content Deployer deploys incoming content from the Content Manager to the Storage Layer, which stores the content in the Content Data Store, which is a database or the file system ). You can extend the Storage Layer to enable storage to any medium. You configure storage in the Storage Layer configuration file.
A local file system is the hard disk of the Presentation Server or a network-accessible hard disk. Content Data Store supports Microsoft SQL Server and Oracle databases.
The Storage Layer uses reference counting to keep track of the relations between pieces of content.