TuneUp Utilities - 2003 Manuel d'utilisateur télécharger pdf (Page 116)

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Benchmark

A tool to compare the speed of multiple entities. Benchmarks exist for

hardware, software and services.

BIOS

Short for "Basic Input Output System". Responsible for initializing your

computer so that your operating system can load.

Bit

Short for binary digit, the smallest unit of information on a machine.

The term was first used in 1946 by John Tukey. A single bit can hold

only one of two values: 0 or 1. More meaningful information is obtained

by combining consecutive bits into larger units. For example, a byte is

composed of 8 consecutive bits.

Byte

The smallest addressable data storage unit. A byte consists of 8 bits.

Since a bit can be in one of two states a byte can store one of (2 to the

power of 8) combinations.

Cache

A memory cache, sometimes called a cache store or RAM cache, is a

portion of memory made of high-speed static RAM (SRAM) instead of

the slower and cheaper dynamic RAM (DRAM) used for main memory.

Memory caching is effective because most programs access the same

data or instructions over and over. By keeping as much of this

information as possible in SRAM, the computer avoids accessing the

slower DRAM.

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TuneUp Utilities - 2003 Manuel d'utilisateur Page 116