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
Makes 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.
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 that is held in position with a catch or lever.
Device
Any hardware component or peripheral device, such as a tape drive or tape library, that can receive
and send data.
Device driver
A îš´le that contains the code that is needed to use an attached device.
DHCPv6
The Dynamic Host Conîš´guration Protocol for IPv6. Although IPv6's stateless address
autoconîš´guration removes the primary motivation for DHCP in IPv4, DHCPv6 can still be used to
statefully assign addresses if the network administrator wants more control over addressing.
DH group
Difîš´e-Hellman group.
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.
Display contrast
The brightness of the display on the Operator Panel.
IBM Conîš´dential
Glossary269
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