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96 Glossary
parity — Redundant information that is associated with a block of data.
partition — You can divide a physical disk into multiple physical sections called
partitions with the fdisk command. Each partition can contain multiple logical disks.
You must format each logical disk with the format command.
PCI — Peripheral Component Interconnect. A standard for local-bus
implementation.
PDU — Power distribution unit. A power source with multiple power outlets that
provides electrical power to servers and storage systems in a rack.
peripheral — An internal or external device, such as a diskette drive or keyboard,
connected to a system.
PGA — Pin grid array. A type of processor socket that allows you to remove the
processor chip.
physical disk — A hard drive installed in the RAID enclosure.
pixel — A single point on a video display. Pixels are arranged in rows and columns to
create an image. A video resolution, such as 640 x 480, is expressed as the number of
pixels across by the number of pixels up and down.
POST — Power-on self-test. Before the operating system loads when you turn on
your system, the POST tests various system components such as RAM and physical
disks.
processor — The primary computational chip inside the system that controls the
interpretation and execution of arithmetic and logic functions. Software written for
one processor must usually be revised to run on another processor. CPU is a synonym
for processor.
protected mode — An operating mode that allows operating systems to implement:
• A memory address space of 16 MB to 4 GB
• Multitasking
• Virtual memory, a method for increasing addressable memory by using the
physical disk
The Windows 2003 and Linux 32-bit operating systems run in protected mode. MS-
DOS cannot run in protected mode.