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Chapter 7 Storage. Chapter 7 Objectives. Next. Explain how a compact disc stores data. Differentiate between storage and memory. Understand how to care for a compact disc. Identify various types of storage media and storage devices . Differentiate between CD-ROMs, CD-RWs, and DVD-ROMs.

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chapter 7 objectives
Chapter 7 Objectives

Next

Explain how a compact disc stores data

Differentiate between storage and memory

Understand how to care for a compact disc

Identify various types of storage media and storage devices

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

Explain how a floppy disk stores data

Identify the uses of tape

Identify the advantages of using high-capacity disks

Understand how an enterprise storage system works

Describe how a hard disk organizes data

Explain how to use PC Cards and other miniature storage media

Identify the advantages of using an Internet hard drive

Identify uses of microfilm and microfiche

p. 7.2

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

Memory Versus Storage

Next

p. 7. 2 Fig. 7-1

memory versus storage4
What is memory?

A temporary holding place for data and instructions

Consists of one or more chips on the motherboard

Sometimes called primary storage

Memory Versus 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. 3

memory versus storage5
How does storage differ from memory?

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

Memory Versus Storage

When you are finished with the file, you remove it from memory and return it to storage

When you want to work with a file, you remove it from storage and place it in memory

Next

p. 7. 4

memory versus storage6
How does volatility compare?Memory Versus Storage

Screen DisplayVolatile

Contents of Memory (most RAM) Volatile

Contents of Storage Nonvolatile

State of Computer

C6578 print cartridge$30.25 per cartridge2 cartridges$60.50 total due

ON

Contents of storage retained when power is off

OFF

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

Next

p. 7. 4 Fig. 7-2

memory versus storage7
What is a storage medium and a storage device?Memory Versus Storage

storage device

The computer hardware that records and retrieves items to and from a storage medium

storage medium

The physical material on which a computer keeps data, instructions, and information

Next

p. 7. 4

memory versus storage8
What is reading and writing?Memory Versus Storage

Reading

Process of transferring data, instructions, and information from a storage medium into memory

Serves as a source of input

Writing

Process of transferring items from memory to a storage medium

Serves as a source of output

Next

p. 7. 4

memory versus storage9
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 Versus Storage

faster

more expensive

cost

speed

slower

less expensive

Next

Memory (RAM)

Hard Disk

Compact Disc

Floppy Disk

Tape

p. 7.4 Fig. 7-4

memory versus storage10
What is capacity?

The number of bytes (characters) a storage medium can hold

Manufacturers use many terms to define the capacity of storage media

Memory Versus Storage

Next

Storage Term

Number of bytes

Abbreviation

Kilobyte

KB

1 thousand

Megabyte

MB

1 million

1 billion

Gigabyte

GB

Terabyte

1 trillion

TB

Petabyte

PB

1 quadrillion

p. 7. 4 Fig. 7-3

technology trailblazer
Al Shugart

Joined IBM as a customer engineer in 1951

Supervised a team in 1967 responsible for developing a removable, portable data storage device

Founded Shugart Associates in 1973 and Seagate Technology in 1979

Technology Trailblazer

Next

Click to view Web Link

then click Al Shugart

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” wide

Floppy Disks

Next

p. 7. 7

floppy disks13
What are the parts of a floppy disk?

A thin circular flexible film is enclosed between two liners

A piece of metal called a shutter covers an opening to the recording surface

Floppy Disks

liner

shutter

metal hub

Next

shell

flexible thin film

magnetic coating

Click to view Web Link

then click Floppy Disks

p. 7.6 Fig. 7-5

floppy disks14
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 Disks

floppy disk

floppy disk drive

Next

p. 7.7 Fig. 7-6

floppy disks15
How are floppy disk drives designated?Floppy Disks

One floppy drive

drive A

Two floppy drives

drive A

drive B

Next

p. 7. 6

floppy disks16
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

Floppy Disks

Next

p. 7. 8

floppy disks17
How does a floppy disk drive work?Floppy Disks

Step 1: When you insert the floppy disk into the drive, the shutter moves to the side to expose the recording surface on the disk.

Step 2: When you initiate a disk access, the circuit board on the drive sends signals to control movement of the read/write heads and the disk.

Step 1

Step 2

Step 3: If disk access is a write instruction, the circuit board verifies whether the disk can be written to or not.

Step 6

Step 4: A motor causes the floppy disk to spin.

Step 5: A motor positions the read/write heads over the correct location on the recording surface of the disk.

Step 6: The read/write heads read data from and write data on the floppy disk.

Step 5

Step 4

Step 3

Next

p. 7. 7 Fig. 7-7

floppy disks18
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

Floppy Disks

Downward compatible

Able to recognize and use earlier media

Floppy disk drives are downward compatible

Upward compatible

Able to recognize newer media

Floppy disk drives are not upward compatible

Next

p. 7. 7

floppy disks19
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

Floppy Disks

sector18 per track

track80 per side

Next

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 Fig. 7-8

floppy disks20
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

Floppy Disks

cluster2 to 8 sectors

Next

p. 7.8

floppy disks21
What is formatting?

The process of preparing a disk for reading and writing

Formatting marks bad sectors as unusable

Floppy Disks

Next

p. 7. 8 Fig. 7-9

floppy disks22
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

Floppy Disks

Avoid exposure to heat and cold

Avoid exposure to magnetic fields

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

Never open the shutter and touch the disk’s recording surface

Keep disks in a storage tray when not using them

Next

p. 7.9

floppy disks23
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

Floppy Disks

notch open means you cannot write on the disk

notch closed means you can write on the disk

Next

write-protected

not write-protected

p. 7. 9 Fig. 7-10

high capacity disks
What is a high-capacity disk drive?

A disk drive that uses disks with capacities of 100 MB and greater

High-Capacity Disks

HiFD™ (High-Capacity Floppy Disk) drive

Uses a 200 MB HiFD™ disk

Developed by Sony Electronics, Inc.

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

Next

Click to view Web Link

then click Zip® Drives

p. 7.9

high capacity disks25
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

High-Capacity Disks

instructions

data

information

Next

p. 7.9

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 them

Hard Disks

Hard disk installed in system unit

Next

p. 7. 10 Fig. 7-12

hard disks27
How does a hard disk work?Hard Disks

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

Step 2

Step 1

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

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

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

Step 3

Step 4

Next

p. 7.11 Fig. 7-13

hard disks28
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

Hard Disks

cylinder

track

Next

Click to viewanimation

p. 7. 11 Fig. 7-14

hard disks29
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

Hard Disks

Clearance is approximately two millionths of an inch

Next

hair

read/write head

dust

smoke

gap

p. 7. 12 Fig. 7-15

platter

hard disks30
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

Hard Disks

Hard disk

Approximately 5 to 11 milliseconds

Floppy disk

84 milliseconds or approximately ½ a second

Next

Click to view Web Link

then click Hard Drives

p. 7. 12

hard disks31
A portion of memory that the processor uses to store frequently accessed items

What is a disk cache?

Hard Disks

processor

processor

processor

disk cache

disk cache

disk cache

hard disk

hard disk

hard disk

first request for data — to disk cache

first request for data — to disk cache

Next

second request for data — to hard disk

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

p. 7. 12 Fig. 7-16

hard disks32
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

Hard Disks

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

Next

p. 7. 12

hard disks33
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

Hard Disks

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

small computer system interface (SCSI)

Supports multiple disk drives, as well as other peripherals

You can daisy chain devices together

Next

p. 7. 13

hard disks34
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

Hard Disks

Next

p. 7. 13 Fig. 7-17

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 magazine

Company on the Cutting Edge

Next

Click to view Web Link then click Kingston

Click to view video

p. 7. 13

hard disks36
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

Hard Disks

Next

p. 7.14 Fig. 7-18

hard disks37
How does RAID work?

RAID duplicates data, instructions, and information to improve data reliability

Hard Disks

Mirroring(RAID Level 1)

Striping

Next

  • 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. 14 Fig. 7-19

hard disks38
Windows provides many maintenance and monitoring utilities for a hard disk on the System Tools submenu

What utilities maintain a hard disk drive?

Hard Disks

Next

Click to view Web Link then click Utilities

p. 7. 15 Fig. 7-20

hard disks39
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

Hard Disks

Next

p. 7. 16 Fig. 7-21

hard disks40
What are advantages of an Internet hard drive?Hard Disks

Large audio, video, and graphics files can be downloaded to an Internet hard drive instantaneously

Files can be accessed from any computer or device that has Web access

Others can be authorized to access data from your Internet hard drive

Allows offsite backups of data

Next

p. 7. 16

compact discs
What is a compact disc (CD)?

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

Compact Discs

Next

CD-ROM

CD-RW

CD-R

DVD-ROM

p. 7. 17

compact discs42
How do you use a compact disc?

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

Compact Discs

Insert disc, label side up

Push button to slide out the tray

Next

Push the same button to close the tray

p. 7. 17 Fig. 7-22

compact discs43
How does a laser read data on a compact disc?

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

Compact Discs

Compact disc label

Compact disc label

Compact disc label

Compact disc label

Compact disc label

Step 3

Step 2

Step 1

pit

pit

land

land

lens

lens

lens

lens

lens

lens

lens

lens

0

1

prism

prism

prism

prism

prism

prism

prism

prism

Light-sensing diode

Light-sensing diode

laser diode

laser diode

laser diode

laser diode

laser diode

laser diode

laser diode

laser diode

Next

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

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

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.

p. 7. 18 Fig. 7-23

compact discs44
How is data stored on a compact 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

Compact Discs

Single track spirals to edge of disc

Next

Compact disc sectors

p. 7. 18 Fig. 7-24

compact discs45
What is a jewel box?

A protective case for a compact disc

Place a compact disc in a jewel box to protect data

Compact Discs

Next

p. 7.19 Fig. 7-25

compact discs46
How should you care for a compact disc?Compact Discs

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. 7.19 Fig. 7-26

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

CD-ROMs

Next

p. 7. 20

cd roms48
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

CD-ROMs

Next

Click to view Web Link then click CD-ROMs

p. 7. 20 Fig. 7-27

cd roms49
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)

CD-ROMs

40X 40 X 150 KB per second = 6,000 KB per second or 6 MB per second

75X 75 X 150 KB per second = 12,250 KB per second or 12.25 MB per second

Next

range of current rates

p. 7.20

cd roms50
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

CD-ROMs

Next

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

p. 7. 21 Fig. 7-28

cd roms51
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?

CD-ROMs

Next

Click to view Web Link

then click Picture CDs

p. 7. 21

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

CD-R and CD-RW

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 rw53
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

CD-R and CD-RW

Next

  • 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

Click to view Web Linkthen click CD-RWs

p. 7. 22

cd r and cd rw54
How is an audioCD created?CD-R and CD-RW

1

1

1

1

1

2a

2a

2a

2a

2b

2b

2b

2b

5

3a

3a

3a

3b

3b

3b

Next

4

4

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

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.

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

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

p. 7. 23 Fig. 7-29

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

DVD-ROMs

Next

Click to view video

p. 7.24 Fig. 7-30

dvd roms56
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

DVD-ROMs

Next

p. 7. 25 Fig. 7-31

dvd roms57
What are other various DVD formats?DVD-ROMs

Digital motion picture DVD

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

DVD-RAM

A rewritable DVD that allows you to erase and record on the disc multiple times

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

Next

Click to view video

p. 7. 25

technology trailblazer58
Mark Dean

Designs microprocessors, improvements in architecture, and hardware innovations for IBM

First African-American to receive an IBM Fellowship, the company’s highest technical ranking

Inducted into the National Inventor's Hall of Fame

Technology Trailblazer

Next

Click to view Web Link

then click Mark Dean

p. 7. 25

company on the cutting edge59
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

Company on the Cutting Edge

Next

Click to view Web Link

then click EMC

p. 7. 26

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

Tapes

Next

Click to view Web Link

then click Tapes

p. 7. 26 Fig. 7-32

tapes61
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

Tapes

Next

p. 7.26 Fig. 7-33

tapes62
What is sequential access versus direct access?Tapes

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

p. 7. 26

enterprise storage systems
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

What is an enterprise storage system?

Enterprise Storage Systems

tape library

tape library

CD-ROM jukeboxes

CD-ROM jukeboxes

CD-ROM jukeboxes

RAID

servers

Next

SAN

NAS device

NAS device

NAS device

NAS device

NAS device

Internet backup

Internet backup

Internet backup

Internet backup

p. 7.27 Fig. 7-34

enterprise storage systems64
What storage techniques are used in an enterprise system?Enterprise Storage Systems

Server

Stores data, information, and instructions need by users on the network

CD-ROM jukebox

Holds hundreds of CD-ROMs that can contain application programs and data

Also called a CD-ROM server

Storage area network (SAN)

A high-speed network that connects storage devices

RAID system

Ensures that data is not lost if one drive fails

Tape library

A high-capacity tape system that works with multiple tape cartridges for storing backups of data, information, and instructions

Internet backup

Stores data, information, and instructions on the Web

Network-attached storage (NAS) device

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

Next

p. 7. 27

enterprise storage systems65
How do organizations handle storage?Enterprise Storage Systems

Data warehouse

A huge database system that stores and manages historical and current transaction data

Enterprise storage system managed in house

Storage management offloaded to an outside organization or online Web service

Next

p. 7. 28

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

PC Cards

Next

Click to view Web Link

then click PC Cards

p. 7. 28 Fig. 7-35

pc cards67
What are the uses of PC Cards?

Three types of PC Card

Advantage of a PC Card for storage is portability between systems

PC Cards

Next

p. 7. 28 Fig. 7-36

miniature mobile storage media
What is miniature mobile storage media?

Handheld devices use miniature mobile storage media to augment internal storage

Miniature Mobile Storage Media

Device Name

Storage Capacity

Type, Use

Next

Clik! Disk

40 MB

Cartridge

Digital cameras, notebook computers

CompactFlash

2 to 256 MB

Memory Card

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

Microdrive

1 GB

Memory card

Digital cameras, handheld computers, music players, video cameras

SmartMedia

2 to 128 MB

Memory Card

Digital cameras, handheld computers, photo printers, cellular telephones

p. 7. 28 Fig. 7-37

miniature mobile storage media69
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

Miniature Mobile Storage Media

Next

p. 7. 29 Fig. 7-38

miniature mobile storage media70
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

Miniature Mobile Storage Media

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p. 7. 29 Fig. 7-39

miniature mobile storage media71
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

Miniature Mobile Storage Media

Store data such as photographs, music, books, and video clips

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

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p. 7. 29

miniature mobile storage media72
What is electronic money?

A means of paying for goods and services over the Internet

Also called digital cash

Miniature Mobile Storage Media

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

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p. 7. 29

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

Microfilm and Microfiche

Microfiche

Uses a small sheet of film, usually about four inches by six inches

Microfilm

Uses a 100- to 215-foot roll of film

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p. 7. 30 Fig. 7-40

microfilm and microfiche74
How do life expectancies of various media compare?

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

Microfilm and Microfiche

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p. 7.30 Fig. 7-41

summary
What are suggested storage devices for computer users?Summary

Large Business

Large Business

Large Business

Home

Home

Home

Mobile

Mobile

Mobile

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

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

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

Power

Power

Small Office/Home Office

Small Office/Home Office

Small Office/Home Office

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

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

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Large Business

Power

p. 7. 31 Fig. 7-42

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

Summary of Storage

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