Shulskhudoghylfh, Slho, Ssp, Surjudpglvnhwwhvhw

SHULSKHUDOGHYLFH

An internal or external device—such as a printer, a disk drive, or a keyboard—con- nected to a computer.

3*$

Abbreviation for pin grid array, a type of microprocessor socket that allows you to remove the microprocessor chip.

SL[HO

Arranged in rows and columns, a pixel is a single point on a video display. Video resolution—640 x 480, for example—is expressed as the number of pixels across by the number of pixels up and down.

3267

Acronym for power-on self-test. Before the operating system loads when you turn on your computer, the POST tests various system components such as RAM, the disk drives, and the keyboard.

SSP

Abbreviation for pages per minute.

34)3

Abbreviation for plastic quad flat pack, a type of microprocessor socket in which the microprocessor chip is permanently mounted.

351

A synonym for the MS-DOS device name LPT1.

SURJUDPGLVNHWWHVHW

The set of diskettes from which you can perform a complete installation of an ap- plication program. When you reconfigure a program, you often need its program dis- kette set.

SURWHFWHGPRGH

An operating mode supported by 80286 or higher microprocessors, protected mode allows operating systems to implement:

‡A memory address space of 16 MB (80286 microprocessor) to 4 GB (Intel386 or higher microprocessor)

‡Multitasking

‡Virtual memory, a method for increasing addressable memory by using the hard-disk drive

The Windows NT 32-bit operating system runs in protected mode. MS-DOS cannot run in protected mode; however, some programs that you can start from MS-DOS—such as Windows—are able to put the computer into protected mode.

Abbreviation for Personal System/2.

363%

Abbreviation for power-supply paralleling board.

39&

Abbreviation for polyvinyl chloride.

4,&

Abbreviation for quarter-inch cartridge.

5$,'

Acronym for redundant arrays of indepen- dent disks. This phrase was introduced by David Patterson, Garth Gibson, and Randy Katz at the University of California at Ber- keley in 1987. The goal of RAID is to use multiple small, inexpensive disk drives to provide high storage capacity and perfor- mance while maintaining or improving the reliability of the disk subsystem.

Patterson, Gibson, and Katz described five different methods, which are known as RAID levels 1 through 5. Each level uses one or more extra drives to provide a means of recovering data lost when a disk fails, so that the effective failure rate of the whole disk subsystem becomes very low.

Recently, Katz has defined a sixth meth- od, RAID 6, which improves reliability even further, and a configuration that pro- vides no data recovery has popularly become known as RAID 0.

5$,'

RAID 0 is commonly called striping. This was not originally defined as a RAID level but has since come into popular use. In this array configuration, data is written

Glossary 13