66 Learning the BasicsUsing the keyboard❖ Back up your files to external media on a regular basis.Label the backup copies clearly and store them in a safeplace.It is easy to put off backing up because it takes time.However, if your internal storage drive suddenly fails, youwill lose all the data on it unless you have a separatebackup copy. For more information, see “Data andsystem configuration backup in the Windows operatingsystem” on page 157.❖ Use Error-checking and Disk Defragmenter regularly tocheck and optimize disk space and improveperformance.❖ Scan all new files for viruses.This precaution is especially important for files youreceive via external media, email, or download from theInternet.❖ Take frequent breaks to avoid repetitive-motion injuriesand eyestrain.❖ Do not turn off the computer if a drive indicator lightindicates a drive is active.Turning off the computer while it is reading from orwriting to a disk may damage the disk, the drive, or both.The Windows operating system records information,such as your desktop setup, during its shutdownprocedure. If you do not let the Windows operatingsystem shut down normally, details such as new iconpositions may be lost.Using the keyboardYour computer’s keyboard contains character keys, controlkeys, function keys, and special Windows keys.(Sample Illustration) KeyboardNOTE