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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.

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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 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

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

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