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.
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.
DES
Data Encryption Standard. A cryptographic algorithm designed to encrypt and decrypt data using a private key.
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 file that contains the code that is needed to use an attached device.
DHCPv6
The Dynamic Host Configuration Protocol for IPv6. Although IPv6's stateless address autoconfiguration 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
Diffie-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.
DLL
Dynamic Link Library. The Microsoft implementation of the shared library concept. These libraries usually have the file extension dll, ocs (for libraries that contain
activeX controls, or drv (for legacy system drivers).
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 personal computer.
DPF
Data Path Failover.
DRAM
Dynamic random-access memory.
drive, magnetic tape
A mechanism for moving magnetic tape and controlling its movement.
Drive Not Configured
This message occurs during the first boot after a factory settings restore is run. This message is not a real issue since it takes time for the library to configure.
DRV
Drive.
DSA key
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