Chapter 7Storage

Differentiate between storage and memory

Identify various types of storage media and storage devices

Explain how a floppy disk stores data

Identify the advantages of using high-capacity disks

Describe how a hard disk organizes data

Identify the advantages of using an Internet hard drive

Explain how a compact disc stores data

Understand how to care for a compact disc

Differentiate between CD-ROMs, CD-RWs, and DVD-ROMs

Identify the uses of tape

Understand how an enterprise storage system works

Explain how to use PC Cards and other miniature storage

media

Identify uses of microfilm and microfiche

Chapter 7 Objectives

p. 7.2

Next

What Type of Storage Do You Use?

What type of storage do you use for saving your computer work?

The hard drive only?

A USB drive? Do you watch movies on DVD or Blu-ray? There are many different

storage methods for computers and other technology. We'll describe each of the

categories of devices they fall under, the general mechanics of each and their

physical characteristics.

p. 7. 2 Fig. 7-1

Memory Versus Storage

What is storage? The media on which data, instructions, and

information are kept, as well as the devices that record and retrieve these items

Next

p. 7. 3

Memory Versus Storage

What is memory? A temporary

holding place for data and instructions

Consists of one or more chips on the motherboard

Sometimes called primary storage

Nonvolatile memory

Does not lose its contents when

power is removed from the computer

Volatile memory

Loses its contents when the computer’s power is turned off

Most memory is volatile

Next

p. 7. 4

Memory Versus Storage

How does storage differ from memory?

When you want to work

with a file, you remove it from storage

and place it in memory

When you are finished with the file, you

remove it from memory and return it to

storage

Storage also called secondary storage, auxiliary storage, permanent storage, or mass storage

Storage holds items such as data, instructions, and information for future use

Storage is nonvolatile

Next

Memory Versus Storage

How does volatility compare?

p. 7. 4 Fig. 7-2

State of Computer

ON

OFF

Screen DisplayVolatile

Contents of Storage

Nonvolatile

Contents of Memory (most RAM)

Volatile

C6578 print cartridge$30.25 per cartridge

2 cartridges$60.50 total due

Contents of storage retained when power is off

Contents of storage retained when power is off

Screen display and contents of most RAM (memory) erased when power is off

Screen display and contents of most RAM (memory) erased when power is off

Next

p. 7. 4

Memory Versus Storage

What is a storage medium and a storage device?

storage medium

The physical material on which a computer

keeps data, instructions, and

information

storage device

The computer hardware that records and retrieves items to

and from a storage medium

Next

Writing

Process of transferring items from memory to a storage medium

Serves as a source of output

p. 7. 4

Memory Versus Storage

What is reading and writing?

Reading

Process of transferring data, instructions,

and information from a storage medium

into memory

Serves as a source of input

Next

p. 7.4 Fig. 7-4

Memory Versus Storage

What is access time? The amount of

time it takes the device to locate an item on a disk

Defines the speed of a disk storage device

Memory (RAM)

Compact Disc

Floppy Disk

Tape

Hard Disk

cost

less

exp

ensi

ve

mor

e ex

pens

ive

speed

faster

slower

Next

p. 7. 4 Fig. 7-3

Memory Versus Storage

What is capacity? The number of

bytes (characters) a storage medium can hold

Manufacturers use many terms to define the capacity of storage media

Storage Term Abbreviation Number

of bytes

Kilobyte

Megabyte

Gigabyte

Terabyte

Petabyte

KB

MB

TB

GB

PB

1 thousand

1 million

1 billion

1 trillion

1 quadrillion

Next

p. 7. 7

Floppy Disks

What is a floppy disk? A portable,

inexpensive storage medium

Consists of a thin, circular, flexible plastic disk with a magnetic coating

Enclosed in a square-shaped plastic shell

Today’s standard disk is 3.5” wideNext

p. 7.7 Fig. 7-6

Floppy Disks

A device that can read from and write on a floppy disk

Most personal computers have a floppy disk drive, in which you insert and remove a floppy disk

What is a floppy disk drive (FDD)?

floppy disk

floppy disk drive

Next

p. 7. 6

Floppy Disks

How are floppy disk drives designated?

Two floppy drives

drive A

drive B

One floppy drive

drive A

Next

p. 7. 8

Floppy Disks

How does a floppy disk store data? A type of magnetic media Uses magnetic patterns to store

items such as data, instructions, and information on a disk’s surface

Able to access (read) data from and place (write) data on a magnetic disk any number of times

The read/write head in the floppy disk drive is the mechanism that actually reads items from or writes items on the floppy disk

Next

16

Internal, External, andPortable Hard Drive Systems

17

Flash Memory Systems

Upward compatible

Able to recognize newer media

Floppy disk drives are not upward compatible

p. 7. 7

Floppy Disks

What is density? The number of bits

in an area on a storage medium

A floppy disk drive must support that floppy disk’s density

Most floppy disks today are high density (HD) with a capacity of 1.44 MB

Next

Downward compatible

Able to recognize and use earlier media

Floppy disk drives are downward compatible

p. 7.8 Fig. 7-8

Floppy Disks

What are tracks and sectors? Track: a narrow

recording band that forms a full circle on the surface of the disk

Pie shaped sections break the tracks into small arcs called sectors

A sector can store up to 512 bytes of data

A typical floppy disk stores data on both sides of the disk

Next

sector18 per track

track80 per

side

80 tracks per side X 18 sectors per track X 2 sides per disk X 512 bytes per sector = 1,474,560 bytes

p. 7.8

Floppy Disks

What is a cluster? The smallest unit of disk space that stores data Also called an allocation unit 2 to 8 sectors depending on the operating system Each cluster holds data from only one file One file can span many clusters

Next

cluster2 to 8 sectors

p. 7. 8 Fig. 7-9

Floppy Disks

What is formatting?

Next

The process of preparing a disk for reading and writing

Formatting marks bad sectors as unusable

p. 7.9

Floppy Disks

How do you care for a floppy? A floppy disk

can last at least seven years

Proper care helps to maximize a disk’s life

Next

Avoid exposure to heat and cold

Avoid exposure to magnetic

fields

Avoid exposure to contaminants such as dust, smoke, or salt air

Keep disks in a storage tray

when not using them

Never open the shutter and touch

the disk’s recording surface

p. 7. 9 Fig. 7-10

Floppy Disks

What is a write-protect notch? A small

opening with a cover that you slide up or down

Protects floppy disks from accidentally being erased

Next

notch closed means you

can write on the disk

notch closed means you

can write on the disk

notch open means you

cannot write on the disk

notch open means you

cannot write on the disk

write-protected

not write-protected

HiFD™ (High-Capacity

Floppy Disk) drive

Uses a 200 MB HiFD™ disk

Developed by Sony Electronics, Inc.

p. 7.9

High-Capacity Disks

What is a high-capacity disk drive? A disk drive that uses disks with capacities of 100 MB

and greater

Next

SuperDisk™ drive

Uses a 120 MB or a 250 MB SuperDisk™

Developed by Imation

Zip® drive

Uses a Zip® disk that can store 100 MB or 250 MB of

data

Developed by Iomega Corporation

built in Zip® drive

Click to view Web Linkthen click Zip® Drives

p. 7.9

High-Capacity Disks

What is a backup? A duplicate of a file, program, or

disk that you can use if the original is lost damaged, or destroyed

High-capacity disks are often used to back up important data and information

Next

data

instructions

information

p. 7. 10 Fig. 7-12

Hard Disks

What a hard disk? Consists of several

inflexible, circular platters that store items electronically

Also called a hard disk drive or a fixed disk

A platter is coated with a material that allows items to be recorded magnetically on its surface

The components of a hard disk are enclosed in an airtight, sealed case to protect themNext Hard disk

installed in system unit

Step 4: The head actuator positions the read/write head arms over the correct location on the platters to read or write data

Step 4

Step 2: A small motor spins the platters while the computer is running

Step 2

Step 3: When software requests a disk access, the read/write heads determine the current or new location of the data

Step 3

Step 1: The circuit board controls the movement of the head activator and a small motor

Step 1

p. 7.11 Fig. 7-13

Hard Disks

How does a hard disk work?

Next

p. 7. 11 Fig. 7-14

Hard Disks

What is a cylinder? The location of a

single track through all platters

A single movement of the read/write head arms can read all the platters of data

Next

trackcylinder

Click to viewanimation

p. 7. 12 Fig. 7-15

Hard Disks

What is a head crash? Occurs when a read/write head touches the surface of a

platter The platters of the hard disk rotate at a high rate of

speed while the computer is running The spinning creates a cushion of air that floats the

read/write head above the platter

Next

hair

read/write head

dustsmoke

platter

gap

Clearance is approximately two millionths

of an inch

Clearance is approximately two millionths

of an inch

p. 7. 12

Hard Disks

How does access time compare for a hard disk and a floppy disk?

A hard disk’s access time is significantly faster than a floppy disk• The hard disk spins

much faster than a floppy disk

• A hard disk spins constantly, while a floppy disk starts spinning only when it receives a read or write command

Next

Hard disk

Approximately 5 to 11

milliseconds

Floppy disk

84 milliseconds or approximately ½ a

second

Click to view Web Linkthen click Hard Drives

processor

hard disk

disk cache

processor

hard disk

disk cache

first request for data — to disk cache

p. 7. 12 Fig. 7-16

Hard Disks

What is a disk cache? A portion of memory that the processor uses to store

frequently accessed items

Next

processor

hard disk

disk cache

second request for data — to hard disk

first request for data — to disk cache

A cache controller manages cache and thus determines which items cache should store

p. 7. 12

Hard Disks

What is a partition? You can divide a

formatted hard disk into separate areas called partitions

Done by issuing a special operating system command

Each partition functions as if it were a separate hard disk drive

Next

drive C

Designation for first partition or for a single

partition on the hard disk

drive D

Designation for second partition on the hard

disk

USB port

Used as interface for many external hard disk

drives

Enhanced Integrated Drive Electronics (EIDE)

One of the most widely used controllers

Supports up to four hard disks

p. 7. 13

Hard Disks

What is a disk controller? A special purpose chip and

associated electronic circuits that control the transfer of data, instructions, and information from a disk to the rest of the computer

Sometimes called an interface A hard disk controller (HDC)

is the interface for a hard disk May be part of the disk drive

or a separate card inside the system unit

Next

small computer system interface (SCSI)

Supports multiple disk drives, as well as other peripherals

You can daisy chain devices together

p. 7. 13 Fig. 7-17

Hard Disks

What is a removable hard disk? A disk drive in which a plastic or metal case surrounds

the hard disk so you can remove it from the drive A popular, reasonably priced, removable hard disk is the

Jaz® disk by Iomega

Next

p. 7. 13

Company on the Cutting Edge

Kingston Technology

The world’s leading independent manufacturer of memory products of computers, servers, digital cameras, and other electronic devices

Founded by John Tu and David Sun in 1987

Markets more than 2,000 products

Designated as one of the 100 Best Companies to Work for in the United States by Fortune magazineClick to

view video

Next

Click to view Web Link then click Kingston

p. 7.14 Fig. 7-18

Hard Disks

What is RAID? Redundant array of independent disks A type of hard disk system that connects several

smaller disks into a single unit that acts like a single large hard disk

More reliable than a traditional disk system but quite expensive

Next

p. 7. 14 Fig. 7-19

Hard Disks

How does RAID work? RAID duplicates data, instructions, and information to improve data

reliability

Next

Mirroring(RAID Level 1)

Striping

Level 1, called mirroring, has one backup disk for each disk

Levels beyond level 1 use a technique called striping, which splits data, instructions, and information across multiple disks in the array

p. 7. 15 Fig. 7-20

Hard Disks

Next

Windows provides many maintenance and monitoring utilities for a hard disk on the System Tools submenu

Click to view Web Link then click Utilities

What utilities maintain a hard disk drive?

p. 7. 16 Fig. 7-21

Hard Disks

What is an Internet hard drive? A service on the

Web that provides storage to computer users

Sometimes called online storage

Many offer storage free of charge

Revenues come from advertisers

Next

Allows offsite backups of data

Others can be authorized to access

data from your Internet hard drive

Files can be accessed from any computer or device

that has Web access

Large audio, video, and graphics files can be downloaded to an

Internet hard drive instantaneously

p. 7. 16

Hard Disks

What are advantages of an Internet hard drive?

Next

p. 7. 17

Compact Discs

What is a compact disc (CD)?

Next

A flat, round, portable, metal storage medium that usually is 4.75 inches in diameter and less than one-twentieth of an inch thick

Most personal computers today include some type of compactdisc drive

Also called an optical disc

Available in a variety of formats

CD-RO

M

CD-RCD-RW

DVD-ROM

p. 7. 17 Fig. 7-22

Compact Discs

How do you use a compact disc?

Next

CD drives can read compact discs, including audio discs

Most CD drives include a volume control button and a headphone jack

The drive designation of a CD drive usually follows alphabetically after that of the hard disk

Push button to slide out

the tray

Push button to slide out

the tray

Insert disc, label side upInsert disc,

label side up

Push the same button to close

the tray

Push the same button to close

the tray

Step 3: Reflected light is deflected to a light-sensing diode, which sends digital signals of 1 to the computer. Absence of reflected light is read as a digital signal of 0.

Step 1: A laser diode shines a light beam toward the compact disc.

Step 2: If light strikes a pit, it scatters. If light strikes land, it is reflected back toward the laser diode.

Compact disc label

Compact disc label

lens lens

prism prism

laser diode

laser diode

Step 1Compact disc

label

lens lens

prism prism

laser diode

laser diode

Items are stored using microscopic pits (indentations) and land (flat areas) that are in the middle layer of the disk

A laser light reads items from the compact disc

p. 7. 18 Fig. 7-23

Compact Discs

How does a laser read data on a compact disc?

Next

Step 2Compact disc

label

lens lens

prism prism

laser diode

laser diode

pit land

Step 3Compact disc

label

lens lens

prism prism

laser diode

laser diode

Light-sensing

diode

Light-sensing

diode

0 1

pit land

p. 7. 18 Fig. 7-24

Compact Discs

How is data stored on a compact disc?

Next

Compact disc sectors

Single track spirals to edge of disc

A compact disc typically stores items in a single track

It spirals from the center of the disc to the edge of the disc

The track is divided into evenly sized sectors in which items are stored

p. 7.19 Fig. 7-25

Compact Discs

What is a jewel box? A protective

case for a compact disc

Place a compact disc in a jewel box to protect data

Next

p. 7.19 Fig. 7-26

Compact Discs

How should you care for a compact disc?

Next

1: Do not expose the disc to excessive heat or sunlight.

2: Do not eat, smoke, or drink near a disc.3: Do not stack discs.

4: Do not touch the underside of the disc.5: Do store the disc in a jewel box when not in use.

6: Do hold a disc by its edges.

p. 7. 20

CD-ROMs

What is a CD-ROM? A silver-colored compact disc

that uses the same laser technology as audio CDs for recording music

Can contain text, graphics, audio, and video

The manufacturer writes, or records, the contents of standard CD-ROMs

You cannot erase or modify the contents

A CD-ROM drive or CD-ROM player is used to read items on a CD-ROM

Next

p. 7. 20 Fig. 7-27

CD-ROMs

What is the storage capacity of a CD-ROM? A typical CD-ROM holds

about 650 MB of data, instructions, and information

Manufactures use CD-ROMs to store and distribute today’s multimedia and other complex software

Next

Click to view Web Link then click CD-ROMs

40X 40 X 150 KB per second =

6,000 KB per second or 6 MB per second

p. 7.20

CD-ROMs

What is the data transfer rate of a CD-ROM drive? The time it takes a drive to transmit data, instructions, and

information from the drive to another device Slower CD-ROM drives produce choppy images or sound Drive speed measured relative to original CD-ROM drives

(150 KB per second)

Next

75X 75 X 150 KB per second =

12,250 KB per second or 12.25 MB per second

range of current rates

p. 7. 21 Fig. 7-28

CD-ROMs

What is a PhotoCD? A compact disc that contains digital photographic

images saved in the PhotoCD format Based on a file format developed by Eastman Kodak Used by commercial and

professional users

Next

A multisession disc, which means you can write additional data, instructions, and information to the disc at a later time

p. 7. 21

CD-ROMs

Next

A single-session disc offered by Kodak

Stores digital versions of photographs for consumers

Single-session means all items are written to the disc at one time

Film developers create the images on the disc from photographic negatives at the time a roll of film is developed

What is a Picture CD?

Click to view Web Linkthen click Picture CDs

p. 7. 22

CD-R and CD-RW

What is a CD-R (compact disc-recordable)? A multisession compact disc onto which you can

record your own items such as text, graphics, and audio

You write on the CD-R using a CD recorder or a CD-R drive and special software

Next

The CD-R drive can read and write both audio CDs and standard CD-ROMs

You cannot erase the disc’s contents

Most CD-ROM drives can read a CD-R

p. 7. 22

CD-R and CD-RW

What is a CD-RW (compact disc-rewritable)? An erasable disc you can write on multiple times You must have CD-RW software

and a CD-RW drive

Next

Click to view Web Linkthen click CD-RWs

Discs can be read only by multiread CD-ROM drives

• Drives that can read audio CDs, data CDs, CD-Rs, and CD-RWs

• Most recent CD-ROM drives are multiread

Step 5: User listens to song on personal computer or removes CD and listens to song on portable CD player.

11

2a 2b

1

2a 2b

3a 3b

1

2a 2b

3a 3b

4

Step 2a: Song is stored on audio CD and purchased by the user.

Step 2b: Song is compressed and stored on the Internet.

Step 3a: User inserts audio CD into CD-ROM drive, plays song, and copies it to the hard disk.

Step 3b: User downloads song as audio file to hard disk.

p. 7. 23 Fig. 7-29

CD-R and CD-RW

How is an audioCD created?

Next

Step 1: Artist composes a song and creates a CD.

Step 4: User copies file to CD-RW disc.

1

2a 2b

3a 3b

4

5

p. 7.24 Fig. 7-30

DVD-ROMs

What is a DVD-ROM (digital video disc-ROM)? An extremely high capacity

compact disc capable of storing from 4.7 GB to 17 GB

You must have a DVD-ROM drive or DVD player to read a DVD-ROM

Looks just like a CD-ROM but data, instructions, and information is stored in a slightly different manner to achieve a higher storage capacity

Click to view video

Next

p. 7. 25 Fig. 7-31

DVD-ROMs

How does a DVD-ROM store data? Three storage techniques used to store DVD-ROM data

• Pits are packed closer together to make the disc more dense

• Two layers of pits are used, where the lower layer is semitransparent so the laser can read through it to the upper layer

• Some are double-sided, which means you can remove the DVD-ROM and turn it over to read the other side

Next

p. 7. 25

DVD-ROMs

What are other various DVD formats?

Next

Digital motion picture DVD

Used to play a movie on your television set or view on the

computer

DVD-R (DVD-recordable)A recordable DVD that you can write on once and read

from many times

DVD+RW

A competing technology to DVD-RAM

DVD-RAMA rewritable DVD that allows you to erase and record on

the disc multiple times

Click to view video

p. 7. 26

Company on the Cutting Edge

EMC2

A provider pf storage systems for some of the world’s largest corporations

Founded in 1979 by Richard Egan and Roger Marino to fill a demand for add-on memory boards in the minicomputer market

Next

Click to view Web Linkthen click EMC

p. 7. 26 Fig. 7-32

Tapes

What is tape? A magnetically coated ribbon of plastic capable of storing large

amounts of data and information at a low cost A tape drive reads from and writes data and information on a tape Older computers used reel-to-reel tape drives A tape cartridge is a small, rectangular, plastic housing for tape

used in today’s tape drives

Next

Click to view Web Linkthen click Tapes

p. 7.26 Fig. 7-33

Tapes

Where is tape used? Used by business and home users to backup personal

computer hard disks Both external and internal tape units for personal

computers Larger computers use tape cartridges mounted in a

separate cabinet called a tape library Three common types of tape drives

Next

p. 7. 26

Tapes

What is sequential access versus direct access?

Next

Sequential access

Method used for tape

Reading and writing data consecutively

You must forward or rewind the tape to a specific point to access

a specific piece of data

Much slower

Utilized most often for long-term storage and backup

Direct access

Method used for floppy disks, hard disks, and compact discs

Also called random access

You can locate a particular data item or file immediately, without having to move consecutively

through items stored in front of the desired data item or file

Faster

Used as the primary method of storage

Next

NAS device Internet backupNAS deviceNAS device

CD-ROM jukeboxes

Internet backup

tape library

NAS device

CD-ROM jukeboxes

Internet backup

RAID

SAN

servers

tape library

NAS device

CD-ROM jukeboxes

Internet backup

p. 7.27 Fig. 7-34

Enterprise Storage Systems

What is an enterprise storage system? A strategy that

focuses on the availability, protection , organization, and backup of storage in a company

Goal is to consolidate storage so operations run as efficiently as possible

Network-attached storage (NAS) device

An easy way to add additional hard disk space to the network

Internet backup

Stores data, information, and instructions on the

Web

CD-ROM jukebox

Holds hundreds of CD-ROMs that can contain application

programs and data

Also called a CD-ROM server

RAID system

Ensures that data is not lost if one drive fails

Server

Stores data, information, and instructions need by

users on the networkTape library

A high-capacity tape system that works with multiple tape

cartridges for storing backups of data, information,

and instructions

p. 7. 27

Enterprise Storage Systems

What storage techniques are used in an enterprise system?

Next

Storage area network (SAN)

A high-speed network that connects storage devices

p. 7. 28

Enterprise Storage Systems

How do organizations handle storage?

Next

Enterprise storage system managed in

house

Data warehouse

A huge database system that stores and manages

historical and current transaction data

Storage management offloaded to an outside organization or online

Web service

p. 7. 28 Fig. 7-35

PC Cards

What is a PC Card? A thin, credit card-sized device Fits into a PC Card slot on a notebook other personal

computer Different types and sizes add storage, additional

memory, communications, and sound capabilities to a computer

Next

Click to view Web Linkthen click PC Cards

p. 7. 28 Fig. 7-36

PC Cards

What are the uses of PC Cards?

Three types of PC Card Advantage of a PC Card for storage is portability

between systems

Next

p. 7. 28 Fig. 7-37

Miniature Mobile Storage Media

What is miniature mobile storage media? Handheld

devices use miniature mobile storage media to augment internal storage

Next

Storage CapacityDevice Name Type, Use

Clik! Disk

CompactFlash

Microdrive

SmartMedia

40 MB

2 to 256 MB

1 GB

2 to 128 MB

Cartridge

Digital cameras, notebook computers

Memory Card

Digital cameras, handheld computers, notebook computers, printers, cellular telephones

Memory card

Digital cameras, handheld computers, music players, video cameras

Memory Card

Digital cameras, handheld computers, photo printers, cellular telephones

p. 7. 29 Fig. 7-38

Miniature Mobile Storage Media

How is miniature storage media used?

Handheld devices, such as players and wallets, read or display the contents of miniature storage media such as memory cards

Next

p. 7. 29 Fig. 7-39

Miniature Mobile Storage Media

What is a smart card? Stores data on a thin

microprocessor embedded in the card

Similar in size to a credit card

Read smart card with a specialized card reader

Information on the smart card can be read and updated

Next

Store data such as photographs, music, books,

and video clips

p. 7. 29

Miniature Mobile Storage Media

What are the types of smart cards? Intelligent smart

card contains a processor and has input, process, output, and storage capabilities

Memory card has only storage capabilities

Next

Store a prepaid dollar amount that is updated when the card is

used

Store patient records, vaccination data, and other

healthcare information

Store tracking information such as customer purchases or

employee attendance

p. 7. 29

Miniature Mobile Storage Media

What is electronic money? A means of

paying for goods and services over the Internet

Also called digital cash

Next

A bank issues unique digital cash numbers

that represent an amount of money

When you purchase digital

cash, the amount of money is

withdrawn from your bank account

To use the card you swipe it

through a card reader

p. 7. 30 Fig. 7-40

Microfilm and Microfiche

What are microfilm and microfiche? Store microscopic images of

documents on roll or sheet film Images recorded onto film using

a computer output microfilm (COM) recorder

Images can only be read with a microfilm or microfiche reader

Next

Microfiche

Uses a small sheet of film, usually

about four inches by six inches

Microfilm

Uses a 100- to 215-foot roll of film

p. 7.30 Fig. 7-41

Microfilm and Microfiche

How do life expectancies of various media compare?

Microfilm and microfiche are inexpensive and have the longest life of any storage medium

Next

Large BusinessHome Mobile

Small Office/Home Office Power

3.5-inch HD floppy disk driveDVD-ROM driveCD-RW drive75 GB hard diskInternet hard drive 2 GB Jaz® drive

Large Business3.5-inch HD floppy disk drive75 GB hard diskDVD-ROM driveCD-RW driveMicrofilm or microficheSmart card readerRAIDTape driveEnterprise storage system

Small Office/Home Office

3.5-inch HD floppy disk drive40 GB hard diskInternet hard driveDVD-ROM driveCD-RW drive2 GB Jaz® drive

3.5-inch HD floppy disk drive1 GB PC Card hard disk10 GB hard diskInternet hard driveDVD-ROM drive or 40X CD-ROM drive

Mobile

p. 7. 31 Fig. 7-42

Summary

What are suggested storage devices for computer users?

Next

Large Business

Power

Home 3.5-inch HD floppy disk drive250 MB Zip® drive30 GB hard diskInternet hard driveDVD-ROM driveCD-RW drive

Large BusinessHome Mobile

Small Office/Home Office Power

Summary of Storage

Memory versus storage Floppy disks High-capacity disks Hard disks Compact discs CD-ROMs CD-R and CD-RW DVD-ROMs Tapes Enterprise storage systems PC Cards Miniature mobile storage media Microfilm and microfiche

Next

Chapter 7 Complete