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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.
CE
Customer engineer; field engineer; service representative.
centimeter (cm)
One one-hundredth of a meter (0.01 m). Approximately 0.39 inch.
channel command
An instruction that directs a data channel, control unit, or device to perform 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 disc, 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.
contingent connection
A connection between a channel path and a drive that is caused when a unit check occurs during
an I/O operation.
controller
A device that provides the interface between a system and one or more tape drives.
153
Glossary
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