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Chapter 6 Storage. Chapter 6 Objectives. Next. Differentiate among various CD and DVD formats. Describe the characteristics of magnetic disks. Identify the uses of tape. Describe the characteristics of a hard disk.

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chapter 6 objectives
Chapter 6 Objectives

Next

Differentiate among various CD and DVD formats

Describe the characteristics ofmagnetic disks

Identify the uses of tape

Describe the characteristics of a hard disk

Discuss PC Cards, ExpressCard modules and the various typesof miniature mobile storage media

Discuss various types of miniature, external, and removable hard disks

Describe the characteristics of optical disks

Identify uses of microfilm and microfiche

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 - 221 Fig. 6-1

storage1
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

storage2
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

storage3
Storage

Next

What isaccess time?

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

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

p. 222 Fig. 6-3

magnetic disks1
Magnetic Disks

Perpendicular recording

Longitudinal recording

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

then click Perpendicular Recording below Chapter 6

Next

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. 223 Fig. 6-4

magnetic disks2
Magnetic Disks

Sample Hard Disk Characteristics

Advertised capacity 500 GB

Platters 4

Read/write heads 8

Cylinders 16,383

Bytes per second 512

Sectors per track 63

Sectors per drive 973,773,168

Revolutions per minute 7,200

Transfer rate 300 MB p/sec

Access time 8.5 ms

Next

What are characteristics of a hard disk?

actualdiskcapacity

p. 224 Fig. 6-5

magnetic disks3
Magnetic Disks

Next

How does a hard disk work?

p. 224 Fig. 6-6

magnetic disks4
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. 225 Fig. 6-7

cylinder

magnetic disks5
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

p. 225 Fig. 6-8

magnetic disks6
Magnetic Disks

Next

What is RAID?

  • Redundant Array of Independent Disks
  • Connects multiple smaller disks into a single unit that acts as a single large hard disk

p. 226

magnetic disks7
Magnetic Disks

Click to view Web Link, click Chapter 6, Click Web Link from left navigation, then click Miniature Hard Disksbelow Chapter 6

Next

What is a miniature hard disk?

  • Provide greater storage capacities than flash memory
  • Smaller than notebook computer hard disks
  • A pocket hard drive is a self-contained unit

p. 226 Fig. 6-9 and 6-10

magnetic disks8
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. 226 Fig. 6-11

magnetic disks9
Magnetic Disks

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

SCSIcontroller supports up to fifteendevices including hard disks, CDand DVD drives, tape drives, printers, scanners, network cards

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

SAScontroller supports many connecteddevices at once, including hard disks,CD and DVD drives, printers,scanners, digital cameras, and more

Next

What is adisk controller?

  • Chip and circuits that control transfer of items from disk

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

then click SASbelow Chapter 6

p. 227

magnetic disks10
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
  • Others can be authorized to access your data

p. 228 Fig. 6-12

magnetic disks11
Magnetic Disks

Next

What is afloppy disk?

  • Portable, inexpensive storage medium (also called diskette)

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

p. 228

magnetic disks12
Magnetic Disks

Next

What is afloppy disk drive?

  • Device that reads from andwrites to floppy disk
  • Also called secondary storage

External floppy disk drive attaches to a computer with a cable

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.

  • Most PCs include an optical disc drive

Push the same button to close the tray.

p. 229 Fig. 6-14

optical discs1
Optical Discs

Next

How should you care for an optical disc?

p. 230 Fig. 6-15

optical discs2
Optical Discs

Click to view Web Link,click Chapter 6, Click Web Link from 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 discs3
Optical Discs

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

then click Archive CDs below Chapter 6

Next

What is anArchive CD?

p. 232 Fig. 6-18

optical discs4
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 - 233

optical discs5
Optical Discs

CLICK TO START

Next

Video: Got Your Video Right Here

optical discs6
Optical Discs

Next

What is aDVD-ROM(digital versatile disc-ROM or digital video disc-ROM)?

  • Must haveDVD-ROM driveor DVD player to read DVD-ROM
  • Stores databases, music, complex software, and movies
  • Blu-ray discs have storage capacity of up to 100 GB
  • HD-DVD discs have storage capacity of up to 60 GB
  • HD-VMDs have storage capacity of up to 40 GB or more
  • UMD can store up to 1.8 GB

p. 233 Fig. 6-19

optical discs7
Optical Discs

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

then click Blu-ray and HD DVDbelow Chapter 6

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
  • Many types of recordable and rewritable DVDs are available
    • DVD-R and DVD+R
    • DVD-RW, DVD+RW, and DVD-RAM

p. 233 - 234 Fig. 6-20

slide28
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

slide29
Tape

Next

How is data stored on a tape?

  • Sequential access
  • Reads and writes data consecutively, like music tape
  • Unlike direct access — used on hard disks, CDs, and DVDs — which can locate particular item immediately

p. 235

pc cards and expresscard modules
PC Cards and ExpressCard Modules

Next

What arePC Cards and ExpressCard Modules?

  • Adds capabilities to computer
  • Credit-card-sized device commonly used in notebook computers

p. 235 Figs. 6-22

miniature mobile storage media
Miniature Mobile Storage Media

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

then click microSD Cardsbelow Chapter 6

Next

What isminiature mobile storage media?

  • Storage for small mobile devices

p. 236 Fig. 6-23

miniature mobile storage media1
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 64 GB
  • Making the floppy disk nearly obsolete

p. 237 Fig. 6-24

miniature mobile storage media2
Miniature Mobile Storage Media

Next

What is asmart card?

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

p. 237 Fig. 6-25

microfilm and microfiche
Microfilm and Microfiche

Microfilm – 100 – to 215 – 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. 6-26

microfilm and microfiche1
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. 6-27

putting it all together
Putting It All Together

Next

What are recommended storage devices for home users?

  • 320 GB hard disk
  • Online storage
  • CD or DVD drive
  • Card reader/writer
  • USB flash drive

p. 239 Fig. 6-28

putting it all together1
Putting It All Together

Next

What are recommended storage devices for small office/home office (SOHO) users?

  • 1 TB hard disk
  • Online storage
  • CD or DVD drive
  • External hard drive for backup
  • USB flash drive

p. 239 Fig. 6-28

putting it all together2
Putting It All Together

Next

What are recommended storage devices for mobile users?

  • 250 GB hard disk
  • Online storage
  • CD or DVD drive
  • Card reader/writer
  • Portable hard disk for backup
  • USB flash drive

p. 239 Fig. 6-28

putting it all together3
Putting It All Together

Next

What are recommended storage devices for power users?

  • 2.5 TB hard disk
  • Online storage
  • CD or DVD drive
  • Portable hard disk for backup
  • USB flash drive

p. 239 Fig. 6-28

putting it all together4
Putting It All Together

Next

What are recommended storage devices for large business users?

  • Desktop computer
    • 1 TB hard disk
    • CD or DVD drive
    • Smart card reader
    • Tape drive
    • USB flash drive
  • Server or Mainframe
    • Network storage server
    • 40 TB hard disk system
    • CD-ROM or DVD-ROM server
    • Microfilm or microfiche

p. 239 Fig. 6-28

summary of storage
Summary of Storage

Recordable and rewritable DVDs

Internal hard disks

Tape

External and Removable hard disks

PC Cards and ExpressCard Modules

Floppy disks

Flash memory cards

CD-ROMs

USB Flash Drives

Recordable and Rewritable CDs

DVD-ROMs

Smart Cards

Blu-ray Discs and HD DVD discs

Microfilm and microfiche

Chapter 6 Complete