affects host reporting of density and is included to
support legacy needs for transparency. The default of
not masking encrypted densities means that the host
can see a different density code for encrypted vs
non-encrypted tapes (x72 [enc] as opposed to x52
[non-enc]). This feature masks this so the drive reports
the primary density only. Normally this is set to the
drive default (which is to show encr density). If a
legacy setup will not work with a new density code
being reported [for whatever software reason] this will
allow transparent encryption to still be used.

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.

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 desires

more control over addressing.

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. On the Operator Control Panel

(OCP), the brightness of the display can be set by
setting the contrast from 1 (the brightest) to 10 (the
lightest).

dll. Dynamic link library: Microsoft’s implementation

of the shared library concept. These libraries usually
have the file extension DLL, OCX (for libraries
containing ActiveX controls), or DRV (for legacy system
drivers).

download. (1) To transfer programs or data from a

computer to a connected device, typically a personal
computer. (2) 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.

Drive Not Configured. This message occurs during

the first boot after a factory settings restore is executed.
This is not a real issue since it takes the library a while
to configure.
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).

eject. To remove or force out from within.

EKM. The Encryption Key Manager application

EKM Server Settings. Maintaining primary and

secondary EKM servers is desired for maximum
availability of encrypted backup and recovery. These
settings are required for Library Managed Encryption
only.

electronic mail. Correspondence in the form of

messages transmitted between user terminals over a
computer network.

email. See electronic mail.

encryption. To alter (a file, for example) using a secret

code so as to be unintelligible to unauthorized parties.

An encryption enabled drive contains the necessary

hardware and firmware to encrypt and decrypt host
tape application data. Encryption policy and encryption
keys are provided by the host application or host
server.

EPO. Emergency power off.

EPROM. Erasable programmable read only memory.
EQC. Equipment check.

equipment check. An asynchronous indication of a

malfunction.

Error log. A dataset or file in a product or system

where error information is stored for later access.

Glossary H-3