Storage Devices

What Kinds of Peripheral Devices Would Suit Your

Needs?

©2003 The McGraw-Hill Companies

Student Learning Outcomes

1. List and compare eight input devices.2. Define and describe four types of pointing

devices.3. Compare and contrast inkjet and laser printers.4. Define the three major technologies on which

computer storage is based.

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IntroductionIn this chapter storage devices designed to meet the various needs and lifestyles of people. This chapter explores the features available in these devices.

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What Peripheral Devices Suit Your Needs?

Input DevicesInput Devices Output DevicesOutput Devices Storage DevicesStorage Devices

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Storage Devices• Storage device stores information to be

recalled and used at a later time• Storage device consists of:

•Storage medium•Storage device

• Three major technology types for information storage:

•Magnetic•Optical or laser•Flash memory

                     

          

SimNet Concepts Support CD: “Storage Concepts”

©2003 The McGraw-Hill Companies

Storage Medium Terms

– Byte– Kilobyte (KB)– Megabytes (MB)– Gigabytes (GB)– Terabytes (TB)– Petabyte (PB)– Exabyte (EB)

= 8 bits≈ 1 Thousand Bytes≈ 1 Million Bytes≈ 1 Billion Bytes≈ 1 Trillion Bytes≈ 1 quadrillion Bytes≈ 1 quintillion Bytes

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Magnetic and Optical Storage

p. 5.142 & 5.144 Fig. 5.13 & 5.16

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Magnetic Storage Devices: Internal Magnetic Hard Disk

• Magnetic storage devices can be either internal or external• Internal magnetic hard disks are

fixed inside the system unit• External magnetic hard disks are

portable

SimNet Concepts Support CD: “Removable Disks”

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Magnetic Storage Devices: Internal Magnetic Hard Disk

• Internal hard disk is a magnetic storage device with • One or more thin platters that store

information sealed inside the disk drive.

• Read/write heads access the information on surface

• Heads read information while copying it from disk to RAM

• Heads write information when copying it from RAM to disk

                     

          

                     

          

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Magnetic Storage Devices: External Magnetic Hard Disk

• External hard disks are magnetic storage media which are portable storage units that you can connect to your computer as necessary• Great for backup storage devices• Ability to transport your hard disk

from one computer to another

                     

          

                     

          

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Hard Drives• Long term storage system

and application software• Operating system and

application software are copied from the hard disk to memory

• Capacity measured in gigabytes

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Floppy Disks and Zip Disks

• Removable magnetic storage media come in two basic types:– Traditional floppy disks– Zip disks

• These storage media are useful for:– Storing files for backup or security

purposes– Transferring files from one computer

to another

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Removable Magnetic Storage: Floppy Disk

• Floppy Mylar disk– Housed inside a hard plastic

casing– Thin, flexible plastic disk

• 3.5 inch floppy disks– also called floppies, diskettes,

floppy disks– Holds about 1.44 megabytes of

information• High-capacity disks

– Zip® disk

p. 5.144 Fig. 5.15

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Removable Magnetic Storage: Zip Disk

• High capacity plastic platter disk– Called removable hard disks– Provide a higher storage capacity than Mylar

disks• Example - Zip® disk with capacity of 100MB,

250MB, and 750MB

                     

          

                     

          

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Optical Storage• CDs• DVDs• Both are optical

storage and have three formats:– Read-only– Write-once– Read-and-write

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Optical Storage Media• Read-Only

CD-ROM DVD-ROM

• One-Time Writable CD-R DVD-R DVD+R

• Fully Read-and-Write CD-RW DVD-RW or

DVD+RW or DVD-RAM

SimNet Concepts Support CD: “CDs and DVDs”

©2003 The McGraw-Hill Companies

Flash Memory Cards• Flash memory cards have

high-capacity storage laminated inside a small piece of plastic

• Flash flash memory cards do not need a drive with moving parts to operate

                     

          

                     

          

                     

          

                     

          

                     

                   

                     

          

©2003 The McGraw-Hill Companies

Flash Memory Talk

• CompactFlash (CF) • xD-Picture Card (xD) • SmartMedia (SM) Card • SecureDigital (SD) card and

MultiMediaCards (MMC) • Memory Stick Media

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Flash Memory Card Readers• Some devices have flash memory slots

into which you slide your flash memory card

• Other devices can use an external flash memory card reader in order to transfer information

• A flash memory drive is a flash memory storage medium for a computer that is small enough to fit in your pocket and usually plugs directly into a USB port