tape cartridge.
A removable storage case that houses
belt-driven magnetic tape that is wound
on a supply reel and a takeup reel.
tape drive.
A data-storage device that controls the
movement of the magnetic tape in a tape
cartridge. The Dell PowerVault tape drive
houses the mechanism (drive head) that
reads and writes data to the tape. Its
native data capacity is 1500 GB per
cartridge; with 2:1 compression, its
capacity is up to 3000 GB.
tape path.
Within a tape drive, the channel in which
the media moves.
V
VDC. Volts DC (direct current).
volt. The SI (international) unit of potential
difference and electromotive force.
Formally defined as the difference of
electric potential between two points of a
conductor that carries a constant current
of one ampere when the power dissipated
between these points is equal to one watt.
W
wet bulb temperature.
The temperature at which pure water
must be evaporated adiabatically at
constant pressure into a given sample of
air in order to saturate the air under
steady-state conditions. Wet bulb
temperature is read from a wet bulb
thermometer.
write. To make a permanent or transient
recording of data in a storage device or
on a data medium.
write protected.
Applicable to a tape cartridge, the
condition that exists when some logical or
physical mechanism prevents a device
from writing on the tape in that cartridge.
write-protect switch.
Located on the tape cartridge, a switch
that prevents accidental erasure of data.
Pictures of a locked and unlocked
padlock appear on the switch. When you
slide the switch to the locked padlock,
data cannot be written to the tape. When
you slide the switch to the unlocked
padlock, data can be written to the tape.
Write/Read test.
Part of the Test Head diagnostic, a
procedure that determines whether the
tape drive can correctly read from and
write to tape.
Glossary 63
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