An
optical jukebox is a robotic
data storage device that can automatically load and unload
optical discs, such as
Compact Disc,
DVD,
Ultra Density Optical or
Blu-ray disc and can provide
terabytes (TB) and
petabytes (PB) of
tertiary storage. The devices are often called
optical disk libraries,
robotic drives, or autochangers. Jukebox devices may have up to 2,000 slots for disks, and usually have a picking device that traverses the slots and drives. The arrangement of the slots and picking devices affects performance, depending on the space between a disk and the picking device. Seek times and transfer rates vary depending upon the optical technology.