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Storage

Chapter 6. Storage. Overview. List Capacities Describe Hard Disk Characteristics Explain Cloud Storage Advantages Differentiate Between CDs & DVDs Explain Miniature Storage Use Identify the Uses for Tape. Storage. Holds Data, Instructions, & Information For Future Use. Capacity.

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Storage

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  1. Chapter 6 Storage

  2. Overview • List Capacities • Describe Hard Disk Characteristics • Explain Cloud Storage Advantages • Differentiate Between CDs & DVDs • Explain Miniature Storage Use • Identify the Uses for Tape

  3. Storage • Holds Data, Instructions, & Information • For Future Use

  4. Capacity • Number of Bytes Medium can Hold • Average Fortune 1000 Capacity is 1PB computerworld.com 3/07

  5. Volatility • Storage is Non-volatile • Contents Retained when Power is Off • Device • Reading • Transfer Item from Storage Media to Memory • Writing • Transfer Item from Memory to Storage Media • Media • Physical Material • Stores Data, Instructions, & Information

  6. Disk References • A: — Always Primary Floppy Drive • B: — Secondary Floppy If It Exists • C: — Always Primary Hard Drive • D:, E:, F:, Etc. — Next Available Drive • Hard drive • CD-ROM • DVD • USB • Network

  7. Access Time • Time to Locate & Read Data on Media • Time to Deliver Data from RAM to CPU

  8. Hard Disk • Main Storage for System Unit • Internal • Consists of Several Inflexible Platters • Enclosed in Airtight, Sealed Case • Uses Magnetic Particles to Represent Data

  9. Hard Disk • Mechanics

  10. Hard Disk • Formatting • Prepares Disk for Reading & Writing

  11. Hard Disk • Formatting • Track • Circular Band • Sector • Pie-shaped • Cluster • Group of Sectors • Cylinder • Single Track Through All Platters

  12. Hard Disk • Head Crash • Spinning Creates Air Cushion • Floats Read / Write Head Above Platter • Crash • Head Touches Platter Surface • Clearance = Two-millionths of an Inch

  13. Hard Disk • External • Freestanding • Removable • Insert & Remove • Miniature • Used to Back Up or Transfer Files

  14. 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

  15. Cloud • Examples • Digital Photos • Flickr, Picasa • Digital Videos • YouTube • SocNet Content • Facebook, MySpace • Email • Gmail, Hotmail, Yahoo Mail

  16. Optical Disk • Flat, Round, Portable Disc • Made of Metal, Plastic, Lacquer • Stores • Software • Data • Digital Photos • Movies • Music

  17. Optical Disk • Mechanics

  18. 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

  19. 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

  20. Optical Disk • DVD • DVD-ROM • Cannot Erase or Modify Contents • DVD-R & DVD+R • Recordable • DVD-RW, DVD+RW, & DVD-RAM • Rewritable

  21. Optical Disk • DVD • Storage • Two Layers of Pits Can be Used • Lower Layer is Semitransparent • Laser Can Read Through it to Upper Layer

  22. 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

  23. Flash • Types

  24. Flash • Uses

  25. Flash • USB Drive • Plugs into USB Port • ExpressCard Module • Developed by PCMCIA • Used in Notebooks

  26. 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

  27. Other Storage • Magnetic Stripe Card • Contains 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

  28. Other Storage • Microfilm • 100-215-foot Roll of Film • Microfiche • Small Sheet of Film • Usually 4” x 6” • Store Microscopic Images of Docs

  29. Media Life Expectancies

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