IBM Ultrium Gen 6 Installation And User Manual page 105

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.
DNS Directory Name System. This allows the
library to recognize text-based addresses
instead of numeric IP addresses.
download
To transfer programs or data from a
computer to a connected device, typically
a personal computer.
To transfer data from a computer to a
connected device, such as a workstation
or microcomputer.
DRAM
Dynamic random-access memory.
drive, magnetic tape
A mechanism for moving magnetic tape
and controlling its movement.
DRV Drive.
DSE Data security erase.
DSP Digital signal processor.
E
EBCDIC
Extended binary-coded decimal
interchange code.
EC Edge connector. Engineering change.
ECC Error correction code.
EEPROM
Electrically erasable programmable
read-only memory.
EIA Electronics Industries Association.
EIA unit
A unit of measure, established by the
Electronic Industries Association, equal to
44.45 millimeters (1.75 inches).
To remove or force out from within.
eject
electronic mail
Correspondence in the form of messages
transmitted between user terminals over a
computer network.
e-mail See electronic mail.
EPO Emergency power off.
EPROM
Erasable programmable read only
memory.
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Glossary