Site home page
Get alerts when Linktionary is updated
Book updates and addendums
Get info about the Encyclopedia of Networking and Telecommunicatons, 3rd edition (2001)
Download the electronic version of the Encyclopedia of Networking, 2nd edition (1996). It's free!
Contribute to this site
Electronic licensing info
Jukebox Optical Storage Devices
Note: Many topics at this site are reduced versions of the text in "The Encyclopedia of Networking and Telecommunications." Search results will not be as extensive as a search of the book's CD-ROM.
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.