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backhitch
During tape movement (reading or writing), the condition that occurs
when the tape drive must stop the tape, reverse it, and restart tape motion
due to certain events. A backhitch usually occurs when the server's net
(compressed) data rate is less than the drive's data rate.
backreflection
Pertaining to instances where light is launched into an optical fiber in a
forward direction, the light that is returned to the launch point in the
reverse direction.
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.
bar code
A code that represents characters by sets of parallel bars of varying
thickness and separation. The bars are read optically by transverse
scanning.
bar code label
A slip of paper bearing a bar code and having an adhesive backing. The
bar code label must be affixed to a tape cartridge to enable the library to
identify the cartridge and its volume serial number.
bezel
The removable frame that fits over the front of the drive.
bit
The smallest unit of data in a computer. A bit (short for binary digit) has a
single binary value (either 0 or 1). Computers store data and execute
instructions in bit multiples called bytes. In most computer systems, there
are eight bits in a byte.
burst data transfer rate
The maximum speed at which data is transferred.
bus
See SCSI bus.
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.
G-2
TS2360 (3580)