Hardware and Software


Basic Types of Memory Chips



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Basic Types of Memory Chips

Secondary Storage and Output Devices

Cost Comparisons for Various Forms of Data Storage

Secondary Storage Access Methods

  • Sequential access
    • Access in the same order it was written
    • Ex: Need to access memory location 5. Then, you need to go through 1, 2, 3, and 4 first.
  • Direct access
  • Sequential access storage devices (SASD)
  • Direct access storage devices (DASD)

Secondary Storage Devices (1)

  • Magnetic tapes: Similar to audio tapes, SASD
  • Magnetic discs: Hard disk, DASD
  • RAID: Redundant array of independent inexpensive disks
  • SAN: Storage area network
    • Consist of many storage devices
  • Optical discs, DASD
    • CD-ROM

Secondary Storage Devices (2)

  • Magneto-optical discs
  • Digital versatile discs (DVD): Up to 17 GB storage
  • Memory cards
    • Installed in a slot
    • Portable
  • Expandable storage: Removable disk cartridges
    • Portable
    • Zip drives

Types of Secondary Storage

Hard Disc

Storage Area Network

Digital Versatile Disc Player

Expandable Storage

Comparison of Secondary Storage Devices

Input Devices

  • Personal computer input devices
    • Keyboard
    • Mouse
  • Voice-recognition devices
    • Microphone
    • Software to convert voice into bits
  • Digital computer cameras
    • Record images and video
  • Terminals
    • Connects to a powerful server for computations
  • Scanning devices
    • Page
    • Handheld
  • Touch-sensitive Screens

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