This document discusses different types of storage devices. It describes three major technologies for computer storage: magnetic, optical, and flash memory. Magnetic storage includes internal and external hard disks, which use magnetic platters and read/write heads. Optical storage uses CDs and DVDs in read-only, write-once, or read-write formats. Flash memory storage includes cards like CompactFlash, SD cards, and USB flash drives.

1. Storage Devices
What Kinds of Peripheral
Devices Would Suit Your
Needs?

2. ©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.

3. ©2003 The McGraw-Hill Companies
Introduction
In 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”

6. ©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

7. ©2003 The McGraw-Hill Companies
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”

9. ©2003 The McGraw-Hill Companies
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

10. ©2003 The McGraw-Hill Companies
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

11. ©2003 The McGraw-Hill Companies
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

13. ©2003 The McGraw-Hill Companies
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

14. ©2003 The McGraw-Hill Companies
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”

17. ©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

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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