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However, if your hard disk suddenly fails, you will lose all the data on it unless you have a separate backup copy. For more information, see “Data and system configuration backup in the Windows® operating system” on page 185. . Use Error-checking and Disk Defragmenter regularly to conserve disk space and improve performance. . Scan all new files for viruses. This precaution is especially important for files you receive via diskette, email, or download from the Internet. . Take frequent breaks to avoid repetitive-motion injuries and eyestrain. . Do not turn off the computer if a drive indicator light indicates a drive is active. Turning off the computer while it is reading from or writing to a disk may damage the disk, the drive, or both. . Before turning off the computer, use the Shut Down command or Sleep command. See “Using and configuring Sleep mode” on page 78 to learn more about Sleep. NOTE The Windows® operating system records information, such as your desktop setup, during its shutdown procedure. If you do not let the Windows® operating system shut down normally, details such as new icon positions may be lost. Learning the Basics 85 Using the keyboard Using the keyboard Your computer’s keyboard contains character keys, control keys, function keys, and special Windows® keys, providing all the functionality of a full-size keyboard. (Sample Illustration) Keyboard Character keys Typing with the character keys is very much like typing on a typewriter, except that: . The space bar creates a space character instead of just passing over an area of the page. . The lowercase letter l (el) and the number 1 are not interchangeable. . The uppercase letter O and the number 0 are not interchangeable. Making your keyboard emulate a full-size keyboard Although your computer’s keyboard layout is compatible with a standard full-size keyboard, it has fewer keys. A standard full-size keyboard has two Enter, Ctrl, and Alt keys; editing keys; cursor positioning keys; and a numeric keypad. Pressing the Fn key simultaneously in combination with one of the specially marked keys allows you to emulate a full-size keyboard. Your computer’s keyboard has only one Enter key. Most of the time, this does not matter. However, some programs assign separate functions to the regular and numeric pad Enter keys on the fullsized keyboard. Using the Fn key, you can simulate the separate key, as follows: Press Fn and Enter simultaneously to simulate the Enter key on the numeric pad of the enhanced keyboard. 86 86 Learning the Basics Using the keyboard Ctrl, Fn, and Alt keys (Sample Illustration) Ctrl, Fn, and Alt keys The Ctrl, Fn, and Alt keys do different things depending on the program you are using. For more information, see your program documentation. Function keys The function keys (not to be confused with the Fn key) are the 12 keys at the top of the keyboard. (Sample Illustration) Function keys F1 through F12 are called function keys because they exec...

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