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infected disk, software downloaded from the Internet, or e-mail attachments. When an infected program starts, its embedded virus also starts.

A common type of virus is a boot virus, which is stored in the boot sectors of a floppy disk. If the floppy disk is left in the drive when the computer is shut down and then turned on, the computer is infected when it reads the boot sectors of the floppy disk expecting to find the operating system. If the computer is infected, the boot virus may replicate itself onto all the floppy disks that are read or written in that computer until the virus is eradicated.

V — volt — The measurement of electric potential or electromotive force. One V appears across a resistance of 1 ohm when a current of 1 ampere flows through that resistance.

W — watt — The measurement of electrical power. One W is 1 ampere of current flowing at 1 volt.

WHr — watt-hour — A unit of measure commonly used to indicate the approximate capacity of a battery. For example, a 66-WHr battery can supply 66 W of power for 1 hour or 33 W for 2 hours.

wallpaper — The background pattern or picture on the Windows desktop. Change your wallpaper through the Windows Control Panel. You can also scan in your favorite picture and make it wallpaper.

WLAN — wireless local area network. A series of interconnected computers that communicate with each other over the air waves using access points or wireless routers to provide Internet access.

write-protected— Files or media that cannot be changed. Use write-protection when you want to protect data from being changed or destroyed. To write-protect a 3.5-inch floppy disk, slide its write-protect tab to the open position.

WWAN — wireless wide area network. A wireless high- speed data network using cellular technology and covering a much larger geographic area than WLAN.

WXGA — wide-aspect extended graphics array — A video

standard for video cards and controllers that supports resolutions up to 1280 x 800.

XGA — extended graphics array — A video standard for video cards and controllers that supports resolutions up to 1024 x 768.

ZIF — zero insertion force — A type of socket or connector that allows a computer chip to be installed or removed with no stress applied to either the chip or its socket.

Zip — A popular data compression format. Files that have been compressed with the Zip format are called Zip files and usually have a filename extension of .zip. A special kind of zipped file is a self-extracting file, which has a filename extension of .exe. You can unzip a self-extracting file by double-clicking it.

Zip drive — A high-capacity floppy drive developed by Iomega Corporation that uses 3.5-inch removable disks called Zip disks. Zip disks are slightly larger than regular floppy disks, about twice as thick, and hold up to 100 MB of data.

Glossary

D430 specifications

The Dell D430, also known as the Dell Latitude D430, is a compact and portable laptop that was designed to cater to the needs of mobile professionals. Released as part of Dell's Latitude series, the D430 balances performance, durability, and lightweight construction, making it a reliable choice for professionals on the go.

One of the standout features of the Dell D430 is its size and weight. Weighing in at approximately 3.2 pounds and measuring just over one inch in thickness, the D430 is one of the more portable laptops of its time. This lightweight design allows users to easily slip the laptop into a backpack or briefcase without adding significant bulk, while still providing a sturdy build quality that is characteristic of Dell's Latitude line.

Performance-wise, the Dell D430 is equipped with Intel Core 2 Duo processors, which offer a good balance of power and energy efficiency for everyday tasks such as web browsing, document editing, and light multitasking. It typically comes with 2GB of RAM, which can be upgraded to 4GB for enhanced performance when running more demanding applications. The laptop features a 12.1-inch display, which, while smaller than typical laptop screens, maintains a resolution of 1280x800 pixels, providing clear visuals suitable for presentations and media consumption.

In terms of connectivity, the D430 offers a variety of ports and wireless options, making it versatile for different business needs. Equipped with USB 2.0 ports, a VGA output for connecting to external displays, and an RJ-45 Ethernet port, the D430 provides ample connectivity for peripherals and networking. Additionally, the built-in Wi-Fi capability ensures users can stay connected to the internet wherever they go.

Another notable aspect of the Dell D430 is its security features, which are crucial for business professionals. The laptop supports optional fingerprint readers and smart card readers, adding an extra layer of security for sensitive data. Moreover, features such as TPM (Trusted Platform Module) enhance the laptop's data protection and help safeguard users' information against unauthorized access.

Battery life is also a key characteristic of the D430, with options for extended batteries that allow for longer periods of use without needing to recharge. This makes it particularly appealing for professionals who may be out of the office for extended periods.

In conclusion, the Dell D430 combines portability, performance, and security, making it a suitable choice for mobile professionals seeking a reliable laptop for their everyday business needs. Its blend of compact design, solid performance specifications, and essential connectivity options showcase why it remains a respected member of Dell's Latitude series.