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170 Glossary
controller).
NIC — See network adapter.
notification area — The section of the Windows taskbar that contains icons for
providing quick access to programs and computer functions, such as the clock, volume
control, and print status. Also referred to as system tray.
ns — nanosecond — A measure of time that equals one billionth of a second.
NVRAM — nonvolatile random access memory — A type of memory that stores data
when the computer is turned off or loses its external power source. NVRAM is used for
maintaining computer configuration information such as date, time, and other system
setup options that you can set.
O
optical drive — A drive that uses optical technology to read or write data from CDs,
DVDs, or DVD+RWs. Example of optical drives include CD drives, DVD drives, CD-
RW drives, and CD-RW/DVD combo drives.
P
parallel connector — An I/O port often used to connect a parallel printer to your
computer. Also referred to as an LPT port.
partition — A physical storage area on a hard drive that is assigned to one or more
logical storage areas known as logical drives. Each partition can contain multiple
logical drives.
PC Card — A removable I/O card adhering to the PCMCIA standard. Modems and
network adapters are common types of PC Cards.
PCI — peripheral component interconnect — PCI is a local bus that supports 32-and
64-bit data paths, providing a high-speed data path between the processor and devices
such as video, drives, and networks.
PCI Express — A modification to the PCI interface that boosts the data transfer rate
between the processor and the devices attached to it. PCI Express can transfer data at
speeds from 250 MB/sec to 4 GB/sec. If the PCI Express chip set and the device are
capable of different speeds, they will operate at the slower speed.
PCMCIA — Personal Computer Memory Card International Association — The
organization that establishes standards for PC Cards.
PIO — programmed input/output — A method of transferring data between two
devices through the processor as part of the data path.
pixel — A single point on a display screen. Pixels are arranged in rows and columns to