202 Glossary
B
battery life span — The length of time (years) during which a portable computer
battery is able to be depleted and recharged.
battery operating time — The length of time (minutes or hours) that a portable
computer battery powers the computer.
BIOS — basic input/output system — A program (or utility) that serves as an
interface between the computer hardware and the operating system. Unless you
understand what effect these settings have on the computer, do not change them. Also
referred to as system setup.
bit — The smallest unit of data interpreted by your computer.
Blu-ray Disc™ (BD)— An optical storage technology offering storage capacity of up
to 50 GB, full 1080p video resolution (HDTV required), and as many as 7.1 channels
of native, uncompressed surround sound.
Bluetooth
®
wireless technology — A wireless technology standard for short-range
(9 m [29 feet]) networking devices that allows for enabled devices to automatically
recognize each other.
boot sequence — Specifies the order of the devices from which the computer
attempts to boot.
bootable media — A CD, DVD, or floppy disk that you can use to start your
computer. In case your hard drive is damaged or your computer has a virus, ensure that
you always have a bootable CD, DVD, or floppy disk available. Your Drivers and
Utilities media is an example of bootable media.
bps — bits per second — The standard unit for measuring data transmission speed.
BTU — British thermal unit — A measurement of heat output.
bus — A communication pathway between the components in your computer.
bus speed — The speed, given in MHz, that indicates how fast a bus can transfer
information.
byte — The basic data unit used by your computer. A byte is usually equal to 8 bits.
C
C — Celsius — A temperature measurement scale where 0° is the freezing point and
100° is the boiling point of water.
cache — A special high-speed storage mechanism which can be either a reserved
section of main memory or an independent high-speed storage device. The cache
enhances the efficiency of many processor operations.
book.book Page 202 Tuesday, November 27, 2007 10:29 AM
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