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Chapter
6
2/29
Overview
List Capacities
Describe Hard Disk Characteristics
Explain Cloud Storage Advantages
Differentiate Between CDs & DVDs
Explain Miniature Storage Use
Identify the Uses for Tape
Chapter
6
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Capacity
Number of Bytes Medium can Hold
Average Fortune 1000 Capacity is 1PB
computerworld.com 3/07
Chapter
6
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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
Chapter
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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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Hard Disk
Main Storage for System Unit
Internal
Consists of Several Inflexible Platters
Enclosed in Airtight, Sealed Case
Uses Magnetic Particles to Represent Data
Chapter
6
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Hard Disk
FormattingTrack
Circular Band
SectorPie-shaped
ClusterGroup of Sectors
CylinderSingle Track Through All Platters
Chapter
6
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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
Chapter
6
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Hard Disk
External
Freestanding
Removable
Insert & Remove
Miniature
Used to Back Up or Transfer Files
Chapter
6
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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
Chapter
6
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Cloud
ExamplesDigital Photos
Flickr, Picasa
Digital VideosYouTube
SocNet ContentFacebook, MySpace
EmailGmail, Hotmail, Yahoo Mail
Chapter
6
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Optical Disk
Flat, Round, Portable Disc
Made of Metal, Plastic, Lacquer
Stores
Software
Data
Digital Photos
Movies
Music
Chapter
6
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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
Chapter
6
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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
Chapter
6
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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
Chapter
6
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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
Chapter
6
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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
Chapter
6
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Flash
USB Drive
Plugs into USB Port
ExpressCard Module
Developed by PCMCIA
Used in Notebooks
Chapter
6
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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
Chapter
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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
Chapter
6
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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