Read e-book online A+ Certification Study Guide, Fifth Edition (Certification PDF

By Michael Pastore

ISBN-10: 0072227664

ISBN-13: 9780072227666

ISBN-10: 0072227672

ISBN-13: 9780072227673

ISBN-10: 0072254017

ISBN-13: 9780072254013

The single classroom-based built-in learn process for pro certification has been absolutely redesigned throughout--find out not just what to check, yet tips to examine. You’ll get a hundred% whole assurance of all targets for the A+ examination, hundreds of thousands of perform examination questions, and hands-on routines. The CD-ROM positive factors complete perform examination software program with interactive tutorials and lab simulations, plus an adaptive try out engine.

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Extra info for A+ Certification Study Guide, Fifth Edition (Certification Press)

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DVDs can typically store on the order of 5 to 8GB of data. There are new types of DVD devices coming on the market every day. Because CDs and DVDs have no protective covering, it’s important to handle them with care. Scratches, dust, or other material on the CD surface can prevent data from being read correctly. Because data is located on the bottom side of the CD, always lay the CD label side down. The Monitor The function of a monitor is to produce visual responses to user requests. Most desktop computers use cathode ray tube (CRT) monitors or flat panel displays (FPD).

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.

The external cache is called Level 3 cache and is much larger than the Level 2 cache provided on older system boards. Cache memory runs faster than typical RAM and is able to “guess” which instructions the processor is likely to need, then retrieve those instructions from RAM or the hard drive in advance. Cache memory can also hold preprocessed data, such as that used by a game or an applications program. Newer processors can create a decision “tree” of instructions and store these in the cache.

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A+ Certification Study Guide, Fifth Edition (Certification Press) by Michael Pastore


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