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 dedicated to storing data. Contrast with cleaning cartridge.
data check
A synchronous or asynchronous indication of a condition caused by invalid
data or incorrect positioning of data.
dc Direct current.
degauss
To make a magnetic tape nonmagnetic by means of electrical coils carrying
currents that neutralize the magnetism of the tape.
degausser
A device that makes magnetic tape nonmagnetic.
degradation
A decrease in quality of output or throughput or an increase in machine
error rate.
degraded
Decreased in quality of output or throughput or increased machine error
rate.
deserialize
To change from serial-by-bit to parallel-by-byte.
detented
A part being held in position with a catch or lever.
device Any hardware component or peripheral, such as a tape drive or tape
library, that can receive and send data.
device driver
A file that contains the code needed to use an attached device.
DIAG
Diagnostic section of maintenance information manual.
differential
See High Voltage Differential (HVD).
direct access storage
A storage device in which the access time is independent of the location of
the data.
H-4 TS3310 Tape Library Maintenance Information
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