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Chapter 6 Storage. Chapter 6 Objectives. Next. Describe the characteristics of magnetic disks. Differentiate among various CD and DVD formats. Identify the uses of tape. Differentiate between floppy disks and Zip disks.

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chapter 6 objectives
Chapter 6 Objectives

Next

Describe the characteristics ofmagnetic disks

Differentiate among various CD and DVD formats

Identify the uses of tape

Differentiate between floppy disks and Zip disks

Discuss PC Cards and the various typesof miniature mobile storage media

Describe the characteristics ofa hard disk

Identify uses of microfilm and microfiche

Describe the characteristics of optical disks

storage
Storage

Next

  • What isstorage?
  • Holds data, instructions, and information for future use
  • Storage mediumis physical material used for storage
  • Also called secondary storage

p. 220 Fig. 6-1

storage4
Storage

Kilobyte (KB)

1 thousand

Megabyte (MB)

1 million

Gigabyte (GB)

1 billion

Terabyte (TB)

1 trillion

Petabyte (PB)

1 quadrillion

Exabyte (EB)

1 quintillion

Zettabyte (ZB)

1 sextillion

Yottabyte (YB)

1 septillion

Next

  • What iscapacity?
  • Number of bytes (characters) a storage medium can hold

p. 222

storage5
Storage

Functions as source of input

Creates output

Next

  • What is astorage device?

Hardware that records and retrieves items to and from storage media

Reading

Process of transferring items from storage media to memory

Writing

Process of transferring items from memory to storage media

p. 222

storage6
Storage

Stores …

Primary Storage

Memory (most RAM)

Items waiting to be interpretedand executed by the processor

Secondary Storage

Hard Disk

Operating system, applicationsoftware, user data and information

Flash Memory Cards and USB Flash Drives

Digital pictures or files to be transported

CDs and DVDs

Software, backups, movies, music

Tape

Backups

Floppy Disk

Small files to be transported

Next

  • What isaccess time?
  • Time it takes storage device to locate item on storage medium
  • Time required to deliver item from memory to processor

fastertransferrates

slowertransferrates

p. 222

magnetic disks
Magnetic Disks

Trackis narrow recording bandthat forms fullcircle on disk

Sectorstores up to512 bytesof data

Next

  • What aretracks andsectors?

Formatting prepares disk for use and marks bad sectors as unusable

p. 222 Fig. 6-3

magnetic disks8
Magnetic Disks

Click to view Web Link,click Chapter 6, Click Web Linkfrom left navigation,

then click Floppy Disksbelow Chapter 6

Next

  • What is afloppy disk?

shutter

  • Portable, inexpensive storage medium (also called diskette)

shell

liner

magneticcoating

Thin, circular, flexible film enclosedin 3.5” wide plastic shell

metal hub

flexible thin film

p. 223

magnetic disks9
Magnetic Disks

Next

  • What is afloppy disk drive?
  • Device that reads from andwrites to floppy disk

Floppy disk drive built intoa desktop computer

  • One floppy drive, named drive A
  • Also called secondary storage

External floppy disk drive attaches toa computer with a cable

p. 223 Fig. 6-4

magnetic disks10
Magnetic Disks

write-protected

notch openmeans youcannot writeon the disk

not write-protected

hole on thisside meansdisk is highdensity

notch closedmeans youcan write onthe disk

Next

  • What is awrite-protect notch?
  • Small opening with a cover that you slide
  • Protects floppy disk from being erased accidentally

p. 223

magnetic disks11
Magnetic Disks

Click to view Web Link,click Chapter 6, Click Web Linkfrom left navigation,

then click Zip Disks below Chapter 6

Next

  • What is aZip disk?
  • Magnetic medium that stores 100 MB to 750 MB of data
  • Used to back up and to transfer files
  • Backup is duplicate of file, program, or disk in case original is lost
  • Zip disks require aZip drivec—chigh capacity drive that reads from and writes on a Zip disk

c

p. 223 Fig. 6-5

magnetic disks12
Magnetic Disks

Click to view Web Link,click Chapter 6, Click Web Linkfrom left navigation,

then click Hard Disksbelow Chapter 6

Next

hard disk installedin system unit

  • What is ahard disk?
  • High-capacity storage
  • Consists of several inflexible, circular platters that store items electronically
  • Components enclosed in airtight, sealed case for protection

p. 224 Fig. 6-6

magnetic disks13
Magnetic Disks

Sample Hard Disk Characteristics

Advertised capacity 120 GB

Platters 3

Read/write heads 6

Cylinders 16,383

Bytes per second 512

Sectors per track 63

Sectors per drive 234,441,648

Revolutions per minute 7,200

Transfer rate 133 MB per second

Access time 8.9 ms

Next

  • What are characteristics of a hard disk?

actualdiskcapacity

p. 225 Fig. 6-7

magnetic disks14
Magnetic Disks

Next

  • How does a hard disk work?

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

Step 2.Small motor spins platters while computer is running.

Step 4.Head actuator positions read/write head arms over correct location on platters to read or write data.

Step 1.Circuit board controls movement of head actuator and a small motor.

p. 225 Fig. 6-8

video install a new hard drive
Video: Install a New Hard Drive

Next

Speed up your computer with a new hard drive

low quality(click to start)

high quality(click to start)

magnetic disks16
Magnetic Disks

Next

platter

  • What is acylinder?

track

  • Vertical section of track through all platters

sector

  • Single movement of read/write head arms accesses all plattersin cylinder

read/writehead

platter

sides

p. 226 Fig. 6-9

cylinder

magnetic disks17
Magnetic Disks

Next

  • What is ahead crash?
  • Occurs when read/write head touches platter surface
  • Spinning creates cushion of air that floats read/write head above platter
  • Clearance between head and platter is approximately two-millionths of an inch
  • A smoke particle, dust particle, or human hair could render drive unusable

hair

read/write head

dust

clearance

smoke

platter

p. 226 Fig. 6-10

magnetic disks18
Magnetic Disks

Next

  • What is aminiature hard disk?
  • Provide users with greater storage capacities than flash memory
  • Some have a form factor of less than 1 inch
  • Storage capacities range from 2 GB to 100 GB

p. 227 Fig. 6-11

magnetic disks19
Magnetic Disks

Next

  • What areexternal hard disksandremovable hard disks?
  • Used to back up or transfer files

Removable hard disk—hard diskthat you insert and removefrom hard disk drive

External hard disk—freestandinghard disk that connects to system unit

p. 227 Fig. 6-12

magnetic disks20
Magnetic Disks

SATA (Serial Advanced Technology Attachment) controller uses serial signals to transfer data, instructions, and information

EIDE (EnhancedIntegratedDrive Electronics) controller supports four hard disks, provides connections for CD and DVD drives

Chip and circuits that control transfer of items from disk

SCSI(SmallComputerSystemInterface)controller supports up to fifteendevices including hard disks, CDand DVD drives, tape drives, printers,scanners, network cards

Next

  • What is adisk controller?

p. 227 - 228

magnetic disks21
Magnetic Disks

Next

  • What is online storage?
  • Service on Web that provides storage for minimal monthly fee
  • Files can be accessed from any computer with Web access
  • Large files can be downloaded instantaneously
  • Others can be authorized to access your data

p. 228 Fig. 6-13

optical discs
Optical Discs

Next

  • What areoptical discs?

Push the button toslide out the tray.

  • Flat, round, portable metal discs made of metal, plastic, and lacquer
  • Can be read only or read/write

Insert the disc,label side up.

  • Most PCs include an optical disc drive

Push the same buttonto close the tray.

p. 229 Fig. 6-14

optical discs23
Optical Discs

Next

  • How should you care for an optical disc?

Do not exposethe disc to excessiveheat or sunlight

Do store thedisc in a jewelbox whennot in use

Do noteat, smoke, ordrink neara disc

Do not stack discs

Do hold a discby its edges

Do not touchthe undersideof the disc

p. 230 Fig. 6-15

optical discs24
Optical Discs

Click to view Web Link,click Chapter 6, Click Web Linkfrom left navigation,

then click CD-ROMsbelow Chapter 6

Next

  • What is aCD-ROM?
  • Compactdiscread-onlymemory
  • Cannot erase or modify contents
  • Typically holds 650 MB to 1 GB
  • Commonly used to distribute multimedia and complex software

p. 231 Fig. 6-17

optical discs25
Optical Discs

Stores digital versions of roll of film

Film developers offer Picture CD service

Can be modified using photo editing software

Click to view Web Link,click Chapter 6, Click Web Linkfrom left navigation,

then click Picture CDs below Chapter 6

Next

  • What is aPicture CD?

Step 1.Drop off film to be developed. Mark the Picture CD box on the film-processing envelope.

Step 3.At home, print images from Picture CD on your ink-jet photo printer.

Step 2.When you pick up prints and negatives, a Picture CD contains digital images of each photograph.

At a store, print images to Picture CD at kiosk.

p. 232 Fig. 6-18

optical discs26
Optical Discs

Next

  • What areCD-Rs and CD-RWs?

Must haveCD recorderor CD-R drive

CD-R (compact disc-recordable)

—cdisc you can write on once

Cannot erasedisc’s contents

CD-RW (compact disc-rewritable)

—ceerasable disc you can write onmultiple times

Must haveCD-RW softwareandCD-RW drive

p. 232

optical discs27
Optical Discs

Click to view Web Link,click Chapter 6, Click Web Linkfrom left navigation,

then click DVDs below Chapter 6

Next

  • What is aDVD-ROM(digital versatile disc-ROM or digital video disc-ROM)?
  • High capacity disc capable of storing 4.7 GB to 17 GB
  • Must haveDVD-ROM driveor DVD player to read DVD-ROM
  • Stores databases, music, complex software, and movies

p. 233 Fig. 6-19

optical discs28
Optical Discs

Next

  • How does a DVD-ROM store data?
  • Two layers of pits are used, lower layer is semitransparent so laser can read through
  • Some are double-sided
  • Blu-Ray discs currently have a storage capacity of up to 27 GB

p. 233 Fig. 6-20

slide29
Tape

Next

  • What istape?
  • Magnetically coated plastic ribboncapable of storing large amountsof data at low cost
  • Primarily used for backup

p. 234 Fig. 6-21

slide30
Tape

Next

  • How is data stored on a tape?
  • Sequential access
  • Reads and writes data consecutively, like music tape
  • Unlike direct access — used on floppy disks, Zip disks, hard disks, CDs, and DVDs — which can locate particular item immediately

p. 234 - 235

pc cards
PC Cards

Next

  • What is aPC Card?
  • Adds capabilities to computer
  • Credit-card-sized device commonlyused in notebook computers

p. 235 Figs. 6-22–6-23

miniature mobile storage media
Miniature Mobile Storage Media

CompactFlash

Smart Media

Secure Digital

xD Picture Card

Memory Stick

Click to view Web Link,click Chapter 6, Click Web Linkfrom left navigation,

then click Flash Memory Cardsbelow Chapter 6

Next

  • What isminiature mobile storage media?
  • Storage for small mobile devices

p. 236 Fig. 6-24

miniature mobile storage media33
Miniature Mobile Storage Media

Next

  • What is aUSB Flash Drive?
  • Plugs in a USB port on a computer or mobile device
  • Storage capacities up to 4 GB
  • May eventually make the floppy disk obsolete

p. 236 Fig. 6-25

miniature mobile storage media34
Miniature Mobile Storage Media

Click to view Web Link,click Chapter 6, Click Web Linkfrom left navigation,

then click Smart Cardsbelow Chapter 6

Next

  • What is asmart card?
  • Stores data on microprocessor embedded in small card
  • Input, process, output, and storage capabilities

p. 237 Fig. 6-26

microfilm and microfiche
Microfilm and Microfiche

Microfilm — 100- to215-foot roll of film

Microfiche — small sheet of film, usually 4”  6”

Next

  • What aremicrofilmandmicrofiche?

Store microscopic images of documents on roll or sheet of film

Images recorded using computer output microfilm recorder

p. 238 Fig. 6-27

microfilm and microfiche36
Microfilm and Microfiche

Next

  • How do life expectancies of various media compare?
  • Microfilm and microfiche have longest life of any storage media

p. 238 Fig. 6-28

putting it all together
Putting It All Together

Home

Next

  • What are recommended storage devices for home users?
  • 80 GB hard disk
  • Online storage
  • CD or DVD drive
  • Card reader/writer
  • USB flash drive and/or 3.5-inch floppy disk drive

p. 239 Fig. 6-29

putting it all together38
Putting It All Together

Small Office/Home Office (SOHO)

Next

  • What are recommended storage devices for small office/home office (SOHO) users?
  • 750 MB Zip drive
  • 120 GB hard disk
  • Online storage
  • CD or DVD drive
  • External hard drive for backup
  • USB flash drive and/or 3.5-inch floppy disk drive

p. 239 Fig. 6-29

putting it all together39
Putting It All Together

Mobile

Next

  • What are recommended storage devices for mobile users?
  • 80 GB hard disk
  • Online storage
  • CD or DVD drive
  • Card reader/writer
  • Portable hard disk for backup
  • USB flash drive, and/or 2 GB PC Card hard disk, and/or 3.5-inch floppy disk drive

p. 239 Fig. 6-29

putting it all together40
Putting It All Together

Power

Next

  • What are recommended storage devices for power users?
  • CD or DVD drive
  • 300 GB hard disk
  • Online storage
  • Portable hard disk for backup
  • USB flash drive and/or 3.5-inch floppy disk drive

p. 239 Fig. 6-29

putting it all together41
Putting It All Together

Large Business

Next

  • What are recommended storage devices for large business users?
  • Desktop computer
    • 160 GB hard disk
    • CD or DVD drive
    • Smart card reader
    • Tape drive
    • USB flash drive and/or 3.5-inch floppy disk drive
  • Server or Mainframe
    • Network storage server
    • 40 TB hard disk system
    • CD-ROM or DVD-ROM server
    • Microfilm or microfiche

p. 239 Fig. 6-29

summary of storage
Summary of Storage

Recordable and rewritable DVDs

Floppy disks

Tape

Zip disks

PC Cards

Internal hard disks

Flash memory cards

Portable hard disks

USB Flash Drives

CD-ROMs

Recordable and rewritable CDs

Smart Cards

DVD-ROMs

Microfilm and microfiche

Chapter 6 Complete