StorageTek 9840 - Manual (Page 226)

Glossary-2 Sixth Edition 95741
Glossary
burst In data communication, a sequence of
signals counted as one unit in accordance
with some specific criterion or measure. (A)
C
cartridge A storage device that consists of
magnetic tape on supply and takeup reels, in
a protective housing. (IBM)
Cartridge Scratch Loader (CSL) In the
9840 Tape Drive, a device attached to the
9840 drive which automatically feeds
cartridges to the drive. Cartridges are
manually placed in an input bin, and after
use, are deposited automatically in an output
bin.
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.
CHK Check.
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)
cleaning cartridge A cartridge tape
containing special material used to clean the
tape path in a transport.
compress To save storage space by
eliminating gaps, empty fields, redundancy,
or unnecessary data to shorten the length of
records or files. (IBM)
configuration The manner in which the
hardware and software of an information
processing system are 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 See Cartridge Scratch Loader.
CSL operator panel A combination of the
9840 Tape Drive operator panel controls with
additional switches and indicators for the
Cartridge Scratch Loader.
D
data rate The speed of a data transfer
process, normally 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 tape cartridge 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)
differential A SCSI bus alternative that
provides better signal quality with less
crosstalk and noise but requires more power
to drive the signal. The maximum cable
length is 25 m (82 ft).
drive A device for moving magnetic tape
and controlling its movement. (IBM)
DSE See data security erase.
dump To copy the contents of all or part of
virtual storage for the purpose of collecting
error information. (IBM)
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)