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critical information

storage devices

 Storage media hold the data being accessed, as well s the files the system needs to operate and data that needs to be saved. The various types of storage differ in terms of capacity. access time, and the physical type being used

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Hard-disk systems

 

 Hard disks reside inside the computer (usually) and can hold more information than other forms storage. The hard disk,and the host adapter. The controller controls the drive, the hard disk providers a physical medium o storage the data, and the host adapter is the translator.

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Identify principles of personal computers

   Any PC a complex machine. It could be described as a melting pot of various technologies and products, manufactured by a host of companies in many different countries. This diversity is a great advantage because it gives the PC its versatility. However, these components don't always "melt" together into a  unified whole without the help technician. The different products-whether they're hard disk, modems, sound cards, or memory boards-must share one processor and one motherboard and therefor must be designed to work harmony. For this reason, configuration of the computer components is especially emphazed on the A+essential exam, and nearly one-third of the exam's question pool pertais to the objectives reviewed in this chapter

Critical information

This  first objectives blends together many divers topic areas as they relate to PCs Figure 1.1 shows as typical Pc, its components, and their locations.

    For this objective, you need to know about 10 key component categories: storage devices, mother boards, power supplies, processor/CPUs, memory, display devices, input devices, adapter cards, ports and cables, and cooling systems, Each of these is discussed in the section that follow........................

                      

                                           figure 1.1 Typical Pc components