Professor Michael J. LosaccoCIS 1110 – Using Computers

StorageChapter 6

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Overview

List Capacities

Describe Hard Disk Characteristics

Explain Cloud Storage Advantages

Differentiate Between CDs & DVDs

Explain Miniature Storage Use

Identify the Uses for Tape

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Storage

Holds Data, Instructions, & Information

For Future Use

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Capacity

Number of Bytes Medium can Hold

Average Fortune 1000 Capacity is 1PB

computerworld.com 3/07

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Volatility

Storage is Non-volatileContents Retained when Power is Off

DeviceReading

Transfer Item from Storage Media to Memory

WritingTransfer Item from Memory to Storage Media

MediaPhysical MaterialStores Data, Instructions, & Information

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Disk References

A: — Always Primary Floppy DriveB: — Secondary Floppy If It ExistsC: — Always Primary Hard DriveD:, E:, F:, Etc. — Next Available Drive

Hard driveCD-ROMDVDUSBNetwork

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Access Time

Time to Locate & Read Data on Media

Time to Deliver Data from RAM to CPU

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Hard Disk

Main Storage for System Unit

Internal

Consists of Several Inflexible Platters

Enclosed in Airtight, Sealed Case

Uses Magnetic Particles to Represent Data

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Hard Disk

Mechanics

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Hard Disk

Formatting

Prepares Disk for Reading & Writing

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Hard Disk

FormattingTrack

Circular Band

SectorPie-shaped

ClusterGroup of Sectors

CylinderSingle Track Through All Platters

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Hard Disk

Head CrashSpinning Creates Air Cushion

Floats Read / Write Head Above Platter

CrashHead Touches Platter Surface

Clearance = Two-millionths of an Inch

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Hard Disk

External

Freestanding

Removable

Insert & Remove

Miniature

Used to Back Up or Transfer Files

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Cloud

Internet Service

Provides Storage to Computer Users

Benefits

Access Files From Any Computer

Allow Others to Access Their Files

View Time-critical Data Immediately

Store Offsite Backups

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Cloud

ExamplesDigital Photos

Flickr, Picasa

Digital VideosYouTube

SocNet ContentFacebook, MySpace

EmailGmail, Hotmail, Yahoo Mail

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Optical Disk

Flat, Round, Portable Disc

Made of Metal, Plastic, Lacquer

Stores

Software

Data

Digital Photos

Movies

Music

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Optical Disk

Mechanics

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Optical Disk

CD (Compact Disc)CD-ROM

Cannot Erase or Modify Contents

CD-R (Recordable)Cannot Erase Contents Once Written

CD-RW (Rewritable)Can be Erased

Stores About 700 MB

Writing Requires Burner & Software

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Optical Disk

DVD (Digital Video Disc)

DVD Drive & Software Required

High Capacity CD

Used for Movies, Music, Software

12.5MB per Frame

24 Frames per Second

3+ GB per Movie Compressed

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Optical Disk

DVD

DVD-ROM

Cannot Erase or Modify Contents

DVD-R & DVD+R

Recordable

DVD-RW, DVD+RW, & DVD-RAM

Rewritable

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Optical Disk

DVD

Storage

Two Layers of Pits Can be Used

Lower Layer is Semitransparent

Laser Can Read Through it to Upper Layer

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Flash

Solid State Media

Contain No Moving Parts

Solid State Drive (SSD) Benefits

Faster Access Time

Faster Transfer Rates

Generate Less Heat

Consume Less Power

Last Longer

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Flash

Types

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Flash

Uses

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Flash

USB Drive

Plugs into USB Port

ExpressCard Module

Developed by PCMCIA

Used in Notebooks

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Tape

Magnetically Coated Plastic Ribbon

Stores Large Amounts of Data

Low Cost

Used for Backup Purposes

Storage

Sequential Access

Reads / Writes Data Consecutively

Similar to Audio Tape

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Other Storage

Magnetic Stripe CardContains Mag Stripe That Stores Data

Smart Card Stores Data On Microprocessor

Embedded In Card

Prepaid Dollar Amounts

Updated When Card is Used

Healthcare Information

Tracking Information

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Other Storage

Microfilm

100-215-foot Roll of Film

Microfiche

Small Sheet of Film

Usually 4” x 6”

Store Microscopic Images of Docs

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Media Life Expectancies