medium.
A physical material in or on which data
may be represented, such as magnetic
tape.
megabyte (MB).
1,000,000 bytes.
N
network.
A configuration of data processing
devices and software that is connected for
information interchange.
O
oersted.
The unit of magnetic field strength in the
unrationalized centimeter-gram-second
(cgs) electromagnetic system. The oersted
is the magnetic field strength in the
interior of an elongated, uniformly
wound solenoid that is excited with a
linear current density in its winding of
one abamper per 4 pi centimeters of axial
length. .
offline.
The operating condition that the tape
drive is in when the server's applications
cannot interact with it.
online.
The operating condition that the tape
drive is in when the server's applications
can interact with it.
Open Systems.
Computer systems whose standards are
not proprietary.
operating environment.
The temperature, relative humidity rate,
and wet bulb temperature of the room in
which the tape drive routinely conducts
processing.
P
parity. The state of being even-numbered or
odd-numbered. A parity bit is a binary
number that is added to a group of
binary numbers to make the sum of that
group always odd (odd parity) or even
(even parity).
parity error.
A transmission error that occurs when the
received data does not have the parity
that is expected by the receiving system.
This usually occurs when the sending and
receiving systems have different parity
settings.
port. (1) A system or network access point for
data entry or exit. (2) A connector on a
device to which cables for other devices
such as display stations and printers are
attached. (3) The representation of a
physical connection to hardware. A port is
sometimes referred to as an adapter;
however, there can be more than one port
on an adapter.
power connector.
Located at the rear of the tape drive, the
connector to which the internal power
cable of an enclosure connects.
power cord.
A cable that connects a device to a source
of electrical power.
power-off.
To remove electrical power from a device.
power-on, powered-on.
(1) To apply electrical power to a device.
(2) The state of a device when power has
been applied to it.
R
read. To acquire or interpret data from a
storage device, from a data medium, or
from another source.
reboot.
To reinitialize the execution of a program
by repeating the initial program load
(IPL) operation.
record.
The smallest distinct set of data bytes that
is supplied from a server for processing
and recording by a tape drive, and the
smallest distinct set of data to be read
from tape, reprocessed, and made
available to a server by a tape drive.
relative humidity.
The ratio of the amount of water vapor
actually present in the air to the greatest
amount possible at the same temperature.
reset. To return a device or circuit to a clear
state.
Glossary 61
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