Dell PowerVault 725N (Rackmount NAS Appliance) - Manual (Page 17)

PCI
Abbreviation for Peripheral Component Interconnect. PCI is a standard for local-bus implementation developed by Intel Corporation.
PDU
Abbreviation for power distribution unit. A PDU is a power source with multiple power outlets that provides electrical power to servers and storage systems in
a rack.
peripheral device
An internal or external device—such as a printer, a disk drive, or a keyboard—connected to a system.
PGA
Abbreviation for pin grid array, a type of microprocessor socket that allows you to remove the microprocessor chip.
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
Acronym for power-on self-test. Before the operating system loads when you turn on your system, the POST tests various system components such as RAM,
the disk drives, and the keyboard.
program diskette set
The set of diskettes from which you can perform a complete installation of an operating system or application program. When you reconfigure a program, you
often need its program diskette set.
protected mode
An operating mode supported by 80286 or higher microprocessors, protected mode allows operating systems to implement:
l A memory address space of 16 MB (80286 micro--processor) to 4 GB (Intel386™ or higher micro-processor)
l Multitasking
l Virtual memory, a method for increasing addressable memory by using the hard drive
The Windows NT and UNIX® 32-bit operating systems run in protected mode. MS-DOS cannot run in protected mode; however, some programs that you can
start from MS-DOS, such as the Windows operating system, are able to put the system into protected mode.
PS/2
Abbreviation for Personal System/2.
PXE
Acronym for Preboot Execution Environment.
RAID
Acronym for redundant array of independent disks.
RAM
Acronym for random-access memory. The system's primary temporary storage area for program instructions and data. Each location in RAM is identified by a
number called a memory address. Any information stored in RAM is lost when you turn off your system.
RAS
Abbreviation for Remote Access Service. This service allows users running the Windows operating system to remotely access a network from their system
using a modem.
read-only file
A read-only file is one that you are prohibited from editing or deleting. A file can have read-only status if:
l Its read-only attribute is enabled.
l It resides on a physically write-protected diskette or on a diskette in a write-protected drive.
l It is located on a network in a directory to which the system administrator has assigned read-only rights to you.
readme file
A text file included with a software package or hardware product that contains information supplementing or updating the documentation for the software or
hardware. Typically, readme files provide installation information, describe new product enhancements or corrections that have not yet been documented, and
list known problems or other things you need to be aware of as you use the software or hardware.
real mode