The optical-storage subsystem has the following components:
The optical media are the removable optical platters that contain data.
You can keep optical platters in an automated library called a jukebox or autochanger. The jukebox is a cabinet that contains one or more optical platter drives, slots that store the optical platters when they are not mounted, and a robotic arm that transfers platters between the slots and the drives. Optical-storage subsystem commands initiate transport of the platters to and from the drives and manage the input/output (I/O) operations within the optical-storage subsystem.
Jukeboxes are not essential to the optical-storage subsystem. A supported optical-storage subsystem can consist of a stand-alone optical drive that holds only one platter or several stand-alone drives.
You store optical platters off-line on shelves. When a platter is known to the optical-storage subsystem but is not stored in the jukebox where it can be accessed, the platter is said to be on the shelf. The operator is responsible for storage and retrieval of platters to and from the shelf.
The management software for the optical-storage subsystem performs various tasks related to the optical-storage subsystem. It creates optical families and volumes and tracks information about them, chooses which optical drives to use and the optical platters to mount, issues commands to the jukebox, and reads and writes data to the optical platter.
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