User's Guide

Glossary
Quantum A-Series Tape Drives User’s Guide 81
C
C
The degree Celsius (°C) is a unit of temperature.
Cache Specialized RAM used as a buffer between a fast CPU or I/O
channel and storage which has a relatively slow access time (for
example, cartridge or diskette), to avoid slowing down the
former.
Cartridge Tape cartridge. Super DLT tape II or SDLTtape 600A.
Cartridge Receiver At media insertion, the cartridge receiver assembly is
responsible for guiding the media into its operating position,
opening the door, unlocking the cartridge brakes, and securing
the media for operation. At media ejection, the cartridge receiver
assembly reverses the process and automatically ejects the
cartridge a fixed distance from the front of the tape drive.
CE Council of Europe.
CFR Code of Federal Regulations (United States).
Client This could be a standard FTP client or the built-in FTP client
embedded in the SDLT 600A firmware.
CSA Canadian Standards Association, also known as CSA
International.
CTM Cartridge Tape Module. The main function of the CTM is to
provide the magnetic recording media used by the tape drive to
store customer information. The CTM also provides the
protective cartridge, which allows the media to be removed and
stored safely.
CUP Code Update (a firmware update).
D
Data Compression
A process that reduces the amount of storage space
required to hold a particular block of data. Data transfer speed
and total media capacity are affected by the data compression
achieved. In accordance with industry practice, a typical
compression ratio is 2:1 of data storage. Actual compression
ratios achieved depend on the redundancy of data files being
written.
dB A Decibel is a logarithmic unit of sound intensity; 10 times the
logarithm of the ratio of the sound intensity to some reference
intensity.
DC Direct Current is the continuous flow of electricity through a
conductor such as a wire from high to low potential.