Table of Contents
Advertisement
Glossary
burst In data communication, a sequence of
signals counted as one unit in accordance
with a specific criterion or measure. (A)
C
cartridge A storage device that consists of
magnetic tape on supply and take-up reels,
in a protective housing. (IBM)
In the 9840 Tape Drive System, the cartridge
has both the supply and take-up reels.
Cartridges in other tape subsystems may have
only a single supply reel with the take-up
mechanism residing in the drive itself.
channel A functional unit, controlled by the
processor (or host), that handles the transfer
of data between processor storage and local
peripheral equipment. (IBM)
check A detection of an error condition or
test for correct condition.
checksum In error detection, a function of
all bits in a block. If the written and
calculated sums do not agree, an error is
indicated. (IBM)
Chk Check.
cleaning cartridge A cartridge tape
containing special material used to clean the
9840 Tape Drive System.
code Instructions written for a computer.
(IBM)
compress To save storage space by
eliminating gaps, empty fields, redundancy,
or unnecessary data to shorten the length of
records or files. (IBM)
condition One of a set of specified values
that a data item can assume. (IBM)
conditioning time The amount of time to
prepare a tape for use in the 9840 Tape Drive
System.
configuration The manner in which the
hardware and software of an information
Glossary-2
processing system is organized and
interconnected. (T)
configuration error An error that results
from incorrect configuration values.
connector An electrical part used to join
two or more other electrical parts. (IBM)
CSL Cartridge Scratch Loader.
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 tape A cartridge tape formatted for use
as a regular data tape for the system in which
it is used.
diagnostic Pertaining to the detection and
isolation of errors in programs and faults in
equipment. (IBM)
drive A device for moving magnetic tape
and controlling its movement. (IBM)
dump To copy the contents of all or part of
virtual storage for the purpose of collecting
error information. (IBM)
In the 9840 Tape Drive System, to copy the
contents of the drive EEPROM to a cartridge
tape or host file.
dump-formatted cartridge A cartridge on
which the tape has been specially formatted
to store diagnostic dump data.
E
emulation The use of programming
techniques and special machine features to
permit a computing system to execute
programs written for another system. (IBM)
Ninth Edition
95739
Advertisement
Table of Contents
