Browser
A client program that initiates requests to a web server and displays the information that the
server returns.
Buffer
A routine or storage that is used to compensate for a difference in rate of flow of data or time of
occurrence of events, when data is transferred from one device to another.
Bus A facility for transferring data between several devices that are located between two end points,
only one device able to transmit at a specified moment.
byte A string that consists of some bits (usually 8) that are treated as a unit and represent a character.
A fundamental data unit.
C
CA certification
In cryptography, a certificate from a certificate authority (CA).
Capacity
The amount of data that can be contained on storage media and expressed in bytes of data.
Cartridge manual rewind tool
A device that can be fitted into the reel of a cartridge and used to rewind tape into or out of the
cartridge.
Cartridge memory (CM)
Within each data cartridge, an embedded electronics and interface module that can store and
retrieve a cartridge's historical usage and other information.
Cartridge storage slot
Individual slot that is located within a magazine that is used to house tape cartridges.
Caution (notice)
A word to call attention to possible personal harm to people. Contrast with attention and danger.
Centimeter (cm)
One one-hundredth of a meter (0.01 m). Approximately 0.39 inches.
Channel command
An instruction that directs a data channel, control unit, or device to run an operation or set of
operations.
Char Character.
CHK Check.
Cleaning cartridge
A tape cartridge that is used to clean the heads of a tape drive. Contrast with data cartridge.
CoD Capacity on-demand.
Command
A control signal that initiates an action or the start of a sequence of actions.
Compact disc (CD)
A disk, usually 4.75 inches in diameter, from which data is read optically by using a laser.
Compression
The process of eliminating gaps, empty fields, redundancies, and unnecessary data to shorten the
length of records or blocks.
Concurrent
Refers to diagnostic procedures that can be run on one control unit while the rest of the
subsystem remains available for customer applications.
Glossary 157
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