Glossary
184 New Template
shock rating A rating, expressed in Gs which stands for multiples of
gravity, of how much shock a tape drive can sustain without
damage. Operating and non-operating shock levels are usually
specified separately.
SMTP Simple Mail Transfer Protocol. An e-mail protocol on the
Internet that defines the message format and the message
transfer agent.
SNMP simple Network Management Protocol. A protocol that
monitors and controls a network.
SNTP Simple Network Time Protocol. SNTP is based on NTP, the
Network Time Protocol, an industry standard way for computers
to synchronize their time to an external reference standard. NTP
and SNTP are fully interoperable. Each consists of a client, for
example the SuperLoader, which obtains the current time (in
UTC) from either an SNTP server or an NTP one. SNTP and NTP
are in wide use on the Internet. NTP is specified by RFC1305.
SNTP is specified by RFC2030.
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.
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