Glossary
This glossary defines the special terms,
abbreviations, and acronyms that are used in this
publication. If you do not find the term you are
looking for, refer to the index or to the Dictionary
of Computing, 1994.
Numbers
2.5:1 compression
The relationship between the quantity of
data that can be stored with compression
as compared to the quantity of data that
can be stored without compression. In
2.5:1 compression, two and a half times as
much data can be stored with
compression as can be stored without
compression.
2:1 compression
The relationship between the quantity of
data that can be stored with compression
as compared to the quantity of data that
can be stored without compression. In 2:1
compression, two times as much data can
be stored with compression as can be
stored without compression.
A
A. See ampere.
ampere (A).
A unit of measure for electric current that
is equivalent to a flow of one coulomb
per second, or equivalent to the current
produced by one volt applied across a
resistance of one ohm.
adapter.
A circuit board that adds function to a
computer.
adapter card.
A circuit board that adds function to a
computer.
B
backups.
The short-term retention of records used
for restoring essential business and server
files when vital data has been lost
because of program or server errors or
malfunctions.
backward compatible.
Capable of being used with a previous
product that was designed for a similar
purpose. For example, a tape cartridge
that is designed to be used with a modern
tape drive but can also be used with
certain older tape drives. Synonymous
with downward compatible.
bezel. The removable frame that fits over the
front of the tape drive.
burst data transfer rate.
The maximum speed at which data is
transferred.
byte. A string that consists of a certain number
of bits (usually 8) which are treated as a
unit and represent a character. A byte is a
fundamental unit of data.
C
C. See Celsius.
capacity.
The amount of data that can be contained
on storage media and expressed in bytes.
cartridge.
See tape cartridge.
cartridge door.
On a tape cartridge, the hinged barrier
that can be opened to access, or closed to
protect, the magnetic tape within the
cartridge.
cartridge memory.
See LTO cartridge memory.
Celsius (C).
Having a thermostatic scale on which the
interval between the freezing point and
the boiling point of water is divided into
100 degrees, with 0 degrees representing
the freezing point and 100 degrees
representing the boiling point.
cleaning cartridge.
A tape cartridge that is used to clean the
heads of a tape drive. Contrast with data
cartridge.
clockwise.
In the direction that the hands of a clock
rotate, as viewed from the front.
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