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Secondary Storage

Chapter 7 . Secondary Storage. Overview. Discuss Secondary Storage Characteristics Describe Hard Drive Parts Compare Internal And External Hard Drives Discuss Performance Enhancements Define Optical Storage Define Solid-state Storage Define Cloud Storage And Cloud Services

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Secondary Storage

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  1. Chapter 7 Secondary Storage

  2. Overview • Discuss Secondary Storage Characteristics • Describe Hard Drive Parts • Compare Internal And External Hard Drives • Discuss Performance Enhancements • Define Optical Storage • Define Solid-state Storage • Define Cloud Storage And Cloud Services • Discuss Mass Storage

  3. Storage • Primary Storage • Volatile • Temporary • e.g., RAM • Secondary Storage • Nonvolatile • Permanent

  4. Storage • Secondary Storage Characteristics • Media • Physical Material that Holds Data and Programs • Devices • Read or Write to or from Media • Access Speed • Time Required to Read Data and Programs

  5. Storage • Secondary Storage Characteristics • Capacity

  6. Storage • 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. Hard Disks • Main Storage for System Unit • Stores Data Using Magnetic Charges • Positive / Negative Charges Represent Bits • Sealed in Airtight Case • Media • Rigid Metallic Platter

  8. Hard Disks • Platter • Tracks • Rings of Concentric Circles • Sector • Wedge-shaped Sections • Cylinder • Vertically Passes Through Stack of Platters

  9. Hard Disks • Head Crash • Spinning Creates Air Cushion • Floats Read / Write Head Above Platter • Crash • Head Contacts Surface • Clearance = 0.000001”

  10. Hard Disks • Internal • OS • Major Applications • External • Connect Via USB • Protect or Secure Sensitive Information • Back Up Internal Hard Disk Contents • Providing Additional Hard Disk Capacity

  11. Hard Disks • Performance Enhancements • Disk Caching • Performed During Idle Processing Time • Frequently Used Data Read into RAM Cache • RAID (Redundant Arrays of Independent Disks) • Several Hard Disks Treated as a Large-capacity Drive • Fast Access Speed • High Reliability • File Compression • Reduce Space Required to Store Data and Programs

  12. Optical Discs • Laser and Reflected Light Represent Data • Mechanics

  13. Optical Discs • CD (Compact Disc) • DVD (Digital Video Disc) • BD (Blu-ray Disc) • Formats • -ROM • -R • -RW, -RE

  14. Optical Discs • Storage • CD • 700MB • DVD / BD • Two Sides Can be Used • Two Layers of Pits Can be Used • Lower Layer is Semitransparent

  15. Solid-State Storage • Solid–state drives (SSDs) • No Moving Parts, Fast, Durable • Flash Memory Cards • USB Drives (or Flash Drives) • Connect to USB Port

  16. Cloud Computing • Internet Service • Provides Storage to Computer Users • Benefits • Access Files From Any Computer • Allow Others to Access Their Files • Store Offsite Backups • Google Apps • Dropbox • Office 365

  17. Mass Storage Devices • Enterprise Storage System • File Servers • Networked Attached Storage (NAS) • RAID Systems • Tape Libraries • Organizational Cloud Storage

  18. Mass Storage Devices • Storage Area Network (SAN) • Architecture to Link to Remote Storage • User’s Computer Provides File System • SAN Provides Disk Space • Requires • High-speed Network • Special File System

  19. Careers in IT • Disaster Recovery Specialist • Recovering Systems and Data After a Disaster • Create Plans to Prevent / Prepare For Disasters • Bachelor's Degree in Computer Science • Skills in Networking, Security, and Database Administration • Good Communication Skills • Able to Handle High-stress Situations • Annual Salary of $70,000 - $103,000

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