C
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.
CM Cartridge Memory.
cartridge storage slot
Individual slot 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.
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 means of 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 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.
COD Capacity On Demand.
CP Circuit protector.
CPF Control Path Failover.
Glossary H-3
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