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CD-Rs can write data once to a CD-R disc They can also read standard CD-ROMs as well as burned CD-Rs CD-RWs can write data to write-once CD-R discs or to erasable CD-RW discs They can also read CD-RWs, CD-Rs, and CD-ROMs
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DVD-R discs use organic dye technology like a CD-R DVD-Rs are compatible with most DVD drives and players DVD+R is a write-once variation of DVD+RW DVD-RWs use a crystalline phase change coating, allowing them to be erased and re-written DVD-RWs are playable in many DVD drives and players DVD+RW is an erasable disc format based on CD-RW technology DVD+RW discs are readable in many existing DVD drives and players
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Describe Removable Hardware Interfaces
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The last type of storage device we need to discuss in this chapter are flash drives Instead of using magnetically encoded platters or optical discs to store data, flash drives use a memory chip You may recall from our earlier discussion of system memory that one of the problems with DRAM is the fact that it isn t persistent If you turn off the power, you lose all of your data You might be wondering how we can use a memory chip, then, to store persistent PC data This is done using a different type of memory chip Instead of DRAM, a flash drive uses flash memory Flash memory can be electronically erased and reprogrammed Flash memory is also persistent Once written, it retains its contents even if the electrical current is turned off This combination makes flash drives a very useful and very powerful storage solution for PCs They can store large amounts of data in a very small package In fact, most flash drives are so small that they can be carried on a keychain Many times you will hear flash drives referred to as thumb drives due to their small size Essentially, a flash drive is little more than a printed circuit board with a flash memory chip installed that is connected to a USB interface Once plugged into a USB port on your computer, your system can read information from or write information to the flash drive as if it were a small hard disk drive That s it for this topic We ve covered a wide range of PC components Before we end this chapter, we need to cover one more topic: removable hardware
CERTIFICATION OBJECTIVE 202
Describe Removable Hardware Interfaces
In recent years, new hardware interfaces for PCs have been introduced that have revolutionized the way we connect external devices to the system Prior to these interfaces, we could still connect external devices to the system using serial ports, parallel ports, keyboard ports, and mouse ports However, for most of these external devices to work correctly, you had to make sure they were properly connected and turned on (if applicable) before you powered on the PC system itself If you didn t, the system usually wouldn t recognize that the device was attached In addition, you couldn t unplug one external device and connect a new one while the system was running That kind of change usually required a full system reboot With removable hardware interfaces, all of that has changed Now, we can add or remove external devices while the system is running and have the PC automatically
2: Working with PC Hardware
recognize the change In this topic we re going to review the following removable hardware interfaces:
Universal serial bus FireWire IEEE1394 PCMCIA
Let s begin by discussing USB
Universal Serial Bus
Universal serial bus (USB) is a high-speed removable hardware interface that has pretty much replaced serial, parallel, mouse, and keyboard ports on the PC Most PC systems today include an integrated USB interface in the motherboard USB can be used to connect a wide variety of external devices, including:
External hard drives External CD and DVD drives Printers Scanners Digital cameras Mice Keyboards Flash drives
USB connects these devices into a bus A single USB bus can include up to 127 external devices All devices on the bus are grouped into one of three categories:
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