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Jukebox Optical Storage Devices

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A jukebox is an optical disk device that can automatically load and unload optical disks and provide as much as 500 gigabytes of near-line information. The devices are often called optical disk libraries, robotic drives, or autochangers. Jukebox devices may have up to 50 slots for disks, and either a picking device traverses the slots, or the slots move to align with the picking device. The arrangement of the slots and picking devices affects performance, depending on the space between a disk and the picking device. Seek times are around 85 milliseconds and transfer rates are in the 700-Kbit/sec range.

Jukeboxes are used in high-capacity storage environments such as imaging, archiving, and HSM (hierarchical storage management). HSM is a strategy that moves little-used or unused files from fast magnetic storage to optical jukebox devices in a process called migration. If the files are needed, they are demigrated back to magnetic disk. After a certain period of time or nonuse, the files on optical disk might be moved to magnetic tape archives.

Copyright (c) 2001 Tom Sheldon and Big Sur Multimedia.
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