User's Manual

Glossary
DLT-V4 Product Specification 45
T
Take-up Reel The reel inside every tape drive onto which DLTtape or
Super DLTtape media is wound. The in-the-tape drive take-up reel enables
DLTtape and Super DLTtape systems to operate using a single-reel cartridge and
thereby pack more media and data into every cartridge.
TapeAlert™ A firmware feature that monitors and returns the results of the tape
drive’s on-going self-diagnosis activity.
Tape Path The path through which media moves from the cartridge, past the
read/write head, and onto the take-up reel.
TCM The Tape Control Module implements the functions required to buckle and
unbuckle the media and control the media motion.
Termination A physical requirement of the SCSI bus. A terminator is a device
that attaches to both ends of an electrical bus and prevents reflection or echoes of
signals that reach the end of the bus.
Track A linear or angled pattern of data written on a media surface. SDLT tape
drives write information on multiple tracks simultaneously.
Transfer Rate The speed at which the data moves between a host (that is, tape
drive) and a recorded device. Usually expressed as bytes/sec or bits/sec.
TTL Transistor-to-Transistor Logic is a class of digital circuits built from bipolar
junction transistors (BJT), diodes, and resistors. It is the base for the
semiconductor integrated circuit (IC) technology.
TUR Test Unit Ready (see also Take-up Reel).
U
UL Underwriters Laboratories is a testing laboratory, which develops standards
for consumer products, chiefly dealing with product safety.
Unformatted Capacity The total number of usable byes on the media, including
the space that will be required later to record location, boundary definitions, and
timing information. (See also Native Capacity.)
Ultra 320 A tape drive SCSI interface that provides a low-voltage differential
(LVD) mode running up to 160 MB/sec and a single-ended (SE) mode running up
to 40 MB/sec.
USB Universal Serial Bus is a serial bus standard for connecting devices to a
computer.
V
V A Volt is the potential difference across a conductor when a current of one
ampere dissipates one watt of power.
VCCI Voluntary Control Council for Interference by Information Technology
Equipment (Japan).