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Lecture 3 Computer Hardware a nd Storage

Lecture 3 Computer Hardware a nd Storage. Hardware. Term Used to Describe All Physical Components of a Computer and Computer System Anything One Can Touch, Can Feel, or Can Break Is Considered to Be Part of the Computer Hardware. Categories of Hardware. Input To Enter Commands or Data

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Lecture 3 Computer Hardware a nd Storage

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  1. Lecture 3 Computer Hardware and Storage

  2. Hardware • Term Used to Describe All Physical Components of a Computer and Computer System • Anything One Can Touch, Can Feel, or Can Break Is Considered to Be Part of the Computer Hardware

  3. Categories of Hardware • Input • To Enter Commands or Data • Output • To View Results or Store Data • Input/Output (I/O) • To Enter Commands, View Results or Enter and Store Data

  4. Essential Hardware Devices Input Device to Input Data Output Device for Results Central Processing Unit (CPU) to Process Input into Output Memory for the Data Being Processed by the CPU Secondary Storage Device to Save Data for Later Use

  5. Input Devices Centered Around the Interaction Between the User and the Computer Primary Input Device: Keyboard Allows Users to Input Data Directly Numerous Additional Input Devices

  6. Pointing and Touch Devices • Mouse • Pen Based • Digital Writing Systems • Graphics Tablets • Signature Capture Devices • Touch Screens • Touch Pads • Gaming Devices • Trackballs, Control Balls, and Wheels

  7. Scanning Input Devices • Scanners • Readers • Bar Code Reader • Radio Frequency Identification (RFID) • Optical Mark and Character • Magnetic Ink Character Recognition (MICR) • Biometrics

  8. Audio/Visual Input Devices • Digital Cameras • Digital Video Recorders • Audio • Voice Input • Speech Recognition • Music

  9. Output Devices Centered Around the Interaction Between the Computer and the User Primary Output Device: Video Display Unit VDU, Monitor, Screen, or CRT Other Output Devices Printer Drawing Devices Television Disk Drive Speakers Another Computer

  10. Secondary Storage • Devices that Allow the Saving of Computer Programs and Data • The Actual Medium with which the Computer Programs and Data Are Saved

  11. Primary - Secondary Storage • All Commands/Data for the Operation and Execution of the Computer Are Stored in Primary Memory (RAM) • Stored as Electrical Impulses • Electrical Impulses Are Lost Immediately when the Electrical Source Is Cut • Secondary Storage Is Necessary to Save these Computer Commands/Data for Later Use

  12. Storage Media • Means by which Data Is Physically Stored • Magnetic Media • Optical Storage Media • Flash Media (EEPROM) • Electrically Erasable Programmable Read-Only Memory

  13. Physical Storage

  14. Logical Storage How Data Is Arranged or Organized

  15. Lecture 3 Computer Hardware and Storage

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