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Glossary
This glossary defines new or special terms and
abbreviations used in this guide. For definitions
about other 9840/T9840/T9940 drive subsystem
terms, or terms about other StorageTek products,
refer to the glossary in the appropriate manuals.
Many of the definitions are taken from the IBM
Dictionary of Computing. The following letters in
parentheses following the definition indicate the
source of the definition:
(A) The American National Standard Dictionary for
Information Systems, ANSI X3.172-1990, copyright
1990 by the American National Standards Institute
(ANSI).
(E) The ANSI/Electronic Industries Association
(EIA) Standard-440-A, Fiber Optic Terminology.
(I) The Information Technology Vocabulary, developed
by Subcommittee 1, Joint Technical Committee 1,
of the International Organization for
Standardization and International Electrotechnical
Commission (ISO/IEC/JTC1/SC1).
(IBM) The IBM Dictionary of Computing, copyright
1994.
(T) Draft international standards committee
drafts, and working papers being developed by the
ISO/IEC/JTC1/SC1.
A
access time The mean time in seconds from the
load ready position to a distance being
approximately half way from COT (center of tape)
to either EOT (end of tape).
ACSLS See automated cartridge system library
software.
adapter Hardware used to join different
connector types.
ANSI American National Standards Institute.
MT5003
Arbitrated Loop One topology used in Fibre
Channel that provides multiple connections for
devices that share a single loop, over which only
two devices can communicate at once.
Arbitrated Loop Physical Address (AL_PA) A
one-byte value that identifies a port in an arbitrated
loop topology.
Automated Cartridge System Library Software
(ACSLS) UNIX-based software that allows
multiple computing platforms to access a Nearline
automated cartridge system (ACS).
B
Bit (1) A unit of information equal to a 1 or a 0.
(2) Either of the digits 0 or 1 when used in the
binary numeration system. (T)
British thermal unit (Btu) A standard measure
of a device's heat output. The amount of heat
required to raise one pound of water one degree
Fahrenheit.
Btu See British thermal unit.
Byte (1) A string that consists of a number of bits,
treated as a unit, and representing a character. (T)
(2) A number of bits, treated as a unit, and
representing a character.
C
Calorie The amount of heat required to raise one
kilogram of water one degree Celsius. Equal to
3.968 Btu.
cartridge A storage device that consists of
magnetic tape on supply and take up 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
Revision AF
Glossary-1
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