Cgs 1000
This presentation is the property of its rightful owner.
Sponsored Links
1 / 22

CGS 1000 PowerPoint PPT Presentation


  • 88 Views
  • Uploaded on
  • Presentation posted in: General

CGS 1000. Introduction to Computers and Technology Fall 2006. Topics. Chapter 6 Class Activity EX 81 to 111 PPT 4 to PPT 65. Topics Covered. Chapter 5 Objectives Defined Input Discussed about Keyboard Mouse Voice Input Touch Screen Voice input Digital Cameras.

Download Presentation

CGS 1000

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Cgs 1000

CGS 1000

Introduction to Computers and Technology

Fall 2006

Discovering Computers Fundamentals, Third Edition


Topics

Topics

  • Chapter 6

  • Class Activity

    • EX 81 to 111

    • PPT 4 to PPT 65

Discovering Computers Fundamentals, Third Edition


Topics covered

Topics Covered

  • Chapter 5 Objectives

  • Defined Input

  • Discussed about

    • Keyboard

    • Mouse

    • Voice Input

    • Touch Screen

    • Voice input

  • Digital Cameras

  • Discovering Computers Fundamentals, Third Edition


    Chapter 6 objectives

    Chapter 6 Objectives

    Describe the characteristics ofmagnetic disks

    Differentiate among various CD and DVD formats

    Identify the uses of tape

    Describe the characteristics of a hard disk

    Discuss PC Cards and the various typesof miniature mobile storage media

    Differentiate between floppy disks and Zip disks

    Identify uses of microfilm and microfiche

    Describe the characteristics of optical disks

    Discovering Computers Fundamentals, Third Edition


    Storage

    Storage

    • Holds data, instructions, and information for future use

    • Storage medium is physical material used for storage

      • Also called secondary storage

    • What isstorage?

    Discovering Computers Fundamentals, Third Edition


    Storage1

    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

    Storage

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

    • What iscapacity?

    Discovering Computers Fundamentals, Third Edition


    Storage2

    Functions as source of input

    Creates output

    Storage

    • 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

    Discovering Computers Fundamentals, Third Edition


    Storage3

    Storage

    • What isaccess time?

    • Time it takes storage device to locate item on storage medium

    • Time required to deliver item from memory to processor

    Discovering Computers Fundamentals, Third Edition


    Magnetic disks

    Trackis narrow recording bandthat forms fullcircle on disk

    Sectorstores up to512 bytesof data

    Magnetic Disks

    • What aretracks andsectors?

    Formatting prepares disk for use and marks bad sectors as unusable

    Discovering Computers Fundamentals, Third Edition


    Magnetic disks1

    Magnetic Disks

    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

    Discovering Computers Fundamentals, Third Edition


    Magnetic disks2

    Sample Hard Disk Characteristics

    Advertised capacity120 GB

    Platters3

    Read/write heads6

    Cylinders16,383

    Bytes per second512

    Sectors per track63

    Sectors per drive234,441,648

    Revolutions per minute7,200

    Transfer rate133 MB per second

    Access time8.9 ms

    Magnetic Disks

    • What are characteristics of a hard disk?

    actualdiskcapacity

    Discovering Computers Fundamentals, Third Edition


    Magnetic disks3

    Magnetic Disks

    • 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.

    Discovering Computers Fundamentals, Third Edition


    Magnetic disks4

    Magnetic Disks

    platter

    track

    sector

    • What is acylinder?

    • Vertical section of track through all platters

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

    read/writehead

    platter

    sides

    cylinder

    Discovering Computers Fundamentals, Third Edition


    Magnetic disks5

    Magnetic Disks

    • 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

    • What is ahead crash?

    hair

    read/write head

    dust

    smoke

    clearance

    platter

    Discovering Computers Fundamentals, Third Edition


    Magnetic disks6

    Magnetic Disks

    • 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 120 GB

    Discovering Computers Fundamentals, Third Edition


    Magnetic disks7

    Magnetic Disks

    • 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

    Discovering Computers Fundamentals, Third Edition


    Magnetic disks8

    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

    Magnetic Disks

    • What is adisk controller?

    Discovering Computers Fundamentals, Third Edition


    Magnetic disks9

    Magnetic Disks

    • What is online storage?

    • Files can be accessed from any computer with Web access

    • Service on Web that provides storage for minimal monthly fee

    • Large files can be downloaded instantaneously

    • Others can be authorized to access your data

    Discovering Computers Fundamentals, Third Edition


    Magnetic disks10

    Magnetic Disks

    shutter

    • What is afloppy disk?

    • 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

    Discovering Computers Fundamentals, Third Edition


    Magnetic disks11

    Magnetic Disks

    • What is afloppy disk drive?

    • Device that reads from and writes to floppy disk

      • One floppy drive, named drive A

    • Also called secondary storage

    Floppy disk drive built intoa desktop computer

    External floppy disk drive attaches to a computer with a cable

    Discovering Computers Fundamentals, Third Edition


    Magnetic disks12

    Magnetic Disks

    • 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 a Zip drive-high capacity drive that reads from and writes on a Zip disk

    c

    Discovering Computers Fundamentals, Third Edition


    Questions

    Questions?

    Discovering Computers Fundamentals, Third Edition


  • Login