Glossary
SuperLoader User’s Guide 271
soft error
A faulty data reading that does not recur if the same data is
reread from the disk or corrected by ECC. Usually caused by power
fluctuations or noise spikes.
stacker A tape automation system that sequentially loads and unloads
tape cartridges. does not provide random access to cartridges of the data
stored on them.
stepper A type of motor that moves in discrete amounts with each
electrical pulse.
supply reel The reel of tape contained within the DLTtape cartridge.
DLTtape IV, for example, contains 1,800 feet (548.64 m) of tape.
surface The side of the tape that is coated with the magnetic material for
recording data.
sustained transfer rate The data transfer rate of a tape drive in native
mode. for example, the DLT 7000 has a sustained transfer rate of 5 MB in
native mode, and up to 10 MB at 2:1 compression.
system manufacturers Makers of computer systems and tape library
systems.
Symmetric Phase Recording (SPR) A recording technique introduced
with the DLT 7000 that writes data at alternating angles in a herringbone
pattern thereby eliminating the need for guard bands between data
tracks, and providing higher data density.
T
TPI Tracks per Inch. A DLT 7000 tape drive, for example, writes data a
density of 416 tpi, or 208 tracks across the width of the half-inch DLTtape
media.
take-up reel The reel inside every DLT tape drive onto which DLTtape
media is wound. The in-the-drive take-up reel enables DLT tape systems
to operate using a single-reel cartridge and thereby pack more tape and
data into every cartridge.
tape path The path through which tape moves from the cartridge, past
the read/write head, and onto the take-up reel. The patented DLT drive
head guide assembly provides a gentle and solid path that ensures
tracking accuracy and long tape life.
tar A UNIX operating system command that stands for “create tape
archives” and/or extract files.
TCM
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