By Michael Pastore
The one classroom-based built-in learn approach for pro certification has been absolutely redesigned throughout--find out not just what to review, yet tips on how to examine. You’ll get a hundred% entire insurance of all ambitions for the A+ examination, 1000s of perform examination questions, and hands-on routines. The CD-ROM positive aspects complete perform examination software program with interactive tutorials and lab simulations, plus an adaptive try out engine.
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Extra resources for A+ Certification Study Guide, Fifth Edition (Certification Press)
Keyboards, mice, and external devices such as a scanner or Zip drive are considered peripherals. Disk drives, floppy drives, network cards, and other devices that are installed internally to the PC are considered internal peripherals. Many peripheral devices use a proprietary interface or connection to the system, though the trend is to use standardized interfaces as much as possible. Keyboards There are several types of keyboards, including 84- and 101-key designs. Newer keyboards might include a variety of additional keys for accessing the Internet, using Microsoft Windows, and other common functions.
5-inch disk, and vice versa. A 720KB drive can read only 720KB disks. 5-inch disk densities. Hard Drives Hard drives store data in a similar fashion to floppy drives, but they typically are not removable and have a different physical structure (see Figure 1-6). A hard drive, also referred to as a fixed drive, consists of one or more hard platters, stacked on top of but not touching one another. The stack of platters is attached through its center to a rotating pole, called a spindle. vp Wednesday, September 17, 2003 2:37:57 PM Color profile: Generic CMYK printer profile Composite Default screen 16 Chapter 1: CertPrs8 / A+ Certification Study Guide / Pastore / 222766-4 / Chapter 1 Identifying, Adding, and Removing System Components FIGURE 1-6 The internal structure of a hard disk read/write head.
In the 1930s, August Dvorak redesigned the keyboard layout so that the most commonly used characters are in or closest to the home row and are accessed by the strongest fingers. ” Although most people cannot exceed about 60 words per minute on a QWERTY keyboard, speeds on a Dvorak keyboard can reach about 100–120 words per minute— double the rate. Furthermore, the same passage that requires fingers to travel a total of 12 miles on a QWERTY keyboard requires only about 1 mile of travel on a Dvorak keyboard.
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