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A very few PCs use small computer system interface (SCSI) drives SCSI drives are generally faster and more expensive, so they usually show up only in high-end PCs such as network servers or graphics workstations
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Figure 248
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2: The Visible PC
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Almost all CD-ROM and DVD drives are actually PATA drives and connect via a ribbon cable just like a PATA hard drive Figure 250 shows a DVD drive connected to a ribbon cable with a PATA hard drive a very common sight inside a PC
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CDs, DVDs there are so many types of those shiny discs to put in computers! The term optical media describes all of them (Figure 251) Generally, you may break optical media into two groups: CDs and DVDs CDs store around 700 MB and come in three varieties: CD-ROM (read only memory: you can t change the data on them), CD-R (recordable: you can change the data once),
Figure 250
Hard drive and DVD drive
Mike Meyers A+ Guide to Managing and Troubleshooting PCs
Figure 251
Assorted optical-media discs
and CD-RW (rewritable: you can change the data on them over and over) DVDs store much more data around 4 GB, enough for a Hollywood movie and come in even more varieties: DVD-ROM, DVD+R, DVD-R, DVD+RW, and DVD-RW, just to name the more famous ones All of these different optical-media discs require an optical drive that knows how to read them If you want to do anything with a CD-RW disc, for example, you need a CD-RW drive If you want to use a DVD+R disc, you need a DVD+R drive Luckily, most optical drives support many different types of discs, and some support every common type of optical media available! Figure 252 shows typical optical drives Note that some of them advertise the types of media they use Others give no clue whatsoever
11, Removable Media, goes into great detail on the assorted discs and drive types
Know Your Parts
The entire goal of this chapter was to get you to appreciate the names and functions of the different parts of the PC: peripherals, connectors, and components You also learned about ESD and other issues that come into play when working with a PC By starting with the Big Picture view, you may now begin breaking down the individual components on a chapter-by-chapter basis and truly understand at great depth how each component works and how they interconnect with the PC system as a whole
Figure 252
Optical drives
2: The Visible PC
2 Review
Summary
After reading this chapter and completing the exercises, you should understand the following about the visible PC
How the PC Works
Universal Serial Bus (USB) connectors come in three sizes, A, B, and mini-B Many devices plug into USB ports, including keyboards and cameras USB is hot-swappable, so devices may be inserted or removed without restarting the computer Also known as IEEE 1394, the FireWire interface is perfect for high-speed devices, such as digital video cameras PCs rarely have built-in 4- or 6-wire FireWire connectors, so users typically purchase a FireWire adapter card DB connectors come in a variety of sizes, but only one shape You ll find only a few DB connectors on modern PCs, primarily for printers and video The telephone jack is an RJ connector, called an RJ-11 Most network cards have a wider RJ-45 jack Speakers and microphones connect to mini-audio jacks You ll always find these on the back of the system unit; newer models have connectors on the front as well Keyboards connect into either a dedicated mini-DIN keyboard port or a USB port Monitors connect to VGA or DVI ports Mice and trackballs use the mini-DIN or USB ports as well Keeping with the same trend, printers come in one of two common varieties those that plug into a DB-25 port and those that plug into a USB port A joystick plugs into either a 15-pin female DB port or a USB port
The two parts of the PC hardware and software work intimately together to enable you to do work The computer tech knows the four stages of computing: input, processing, output, and storage Understanding how the various pieces of hardware and software interact in each stage enables you to master the art of the PC tech
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