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D
data error rate
The number of errors that occur per a measurable amount of data on a tape.
data rate
The speed of a data transfer process, usually expressed in bits per second or bytes per
second. (IBM)
Data Security Erase (DSE)
A random binary pattern, over-writing existing data, from the point of an "Erase"
command to the End of Tape point.
data tape
A data cartridge formatted for use as a regular data tape for the system in which it is
used.
data tracks
The regions of recorded tape containing user data formed as discreet longitudinal
"tracks" (similar to railroad tracks).
diagnostics
Pertaining to the detection and isolation of errors in programs and faults in
equipment.
drive
A drive controls the movement of the tape and records or reads the data on the tape
as desired by the customer.
dump
To copy the contents of all or part of storage to collect error information.
dynamic host configuration protocol (DHCP)
An IP protocol that a host uses to obtain all necessary configuration information,
including an IP address.
E
emulation
The use of programming techniques and special machine features to permit a
computing system to execute programs written for another system. (IBM)
encryption
The translation of data into a secret code. Encryption is one of the most effective
ways to achieve data security. To read an encrypted file, you must have access to a
special key or password that enables you to decipher it.
enterprise
A representation of the goals, organizational structure, business processes, and
information resources and requirements of an enterprise. (IBM)
Enterprise Systems Connection (ESCON)
A set of IBM products and services that provide a dynamically-connected
environment within an enterprise. (IBM)
Glossary 103
December 2012
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