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.
control path drive
controllerA device that provides the interface between a system and one or more tape
drives.control path drive A drive that communicates messages from the host computer to the
library in which the drive is installed.
cookie A packet of data that is exchanged between the library and a web browser to track configuration.
CP Circuit protector.
CPF Control Path Failover.
CRU Customer Replaceable Unit.
CSA Canadian Standards Association.
ctrl Control.
CU Control unit.
D
danger (notice)
A word to call attention to possible lethal harm to people. Contrast with attention and caution.
data Any representations such as characters or analog quantities to which meaning is or might be
assigned.
data buffer
The storage buffer in the control unit. This buffer is used to increase the data transfer rate
between the control unit and the channel.
data cartridge
A tape cartridge that is dedicated to storing data. Contrast with cleaning cartridge.
data check
A synchronous or asynchronous indication of a condition that is caused by invalid data or
incorrect positioning of data.
dc Direct current.
DCS Designated Cleaning Slot.
degauss
To make a magnetic tape nonmagnetic by using electrical coils that carry currents that neutralize
the magnetism of the tape.
degausser
A device that makes magnetic tape nonmagnetic.
336 IBM TS3100 Tape Library and TS3200 Tape Library: Setup, Operator, and Service Guide Machine Type 3573
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