Quantum DLT 2000 Handbook page 89

Controller
Robotic
cartridge
handler
Barcode
reader
DLTtape
cartridges
Housing
Figure 8-3 "Typical" DLTtape System-Based Library
Design
shows DLTtape drives, robotic cartridge handling system,
DLTtape cartridges, and controller mechanism.
to be loaded individually into storage slots inside the library.
Important Note: be wary of manufacturers' total capacity claims.
Some library makers assume a 2:1 compression ratio in advertising
their total capacity. Compression is highly variable and data depen-
dent and should not be used as a guide in evaluating library capa-
bility. It's best to use total native (uncompressed) storage capacity in
comparing libraries. By multiplying the maximum number of tape
cartridges your library can hold by the total native capacity of each,
you can easily calculate the total native capacity of the library.
Robotic loader mechanism. Every library provides some type of
mechanical device to load and unload tape cartridges. This is the part
of the library that saves you time and allows you to perform unat-
tended backups. The tape handling mechanism can also provide
users with self-service file recovery and near on-line storage access.
card
Multi-cartridge
magazine
Power
supply
DLTtape drives
QUANTUM DLTtape HANDBOOK 8.9