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Itgs Computer hardware

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Computer Hardware

Description

Mind Map on Computer Hardware, created by James Hawksley on 06/10/2015.

Mind Map by James Hawksley, updated more than 1 year ago

	Created by James Hawksley almost 10 years ago

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Resource summary

Computer Hardware

Devices
1. Input
2. Output
3. Hybrid
4. Assistive Technology
Secondary Storage
1. Purpose
  1. Non-volatile device that holds data until it is deleted or overwritten.
  2. Secondary storage is about two orders of magnitude cheaper than primary storage.
2. Types
  1. Magnetic
    1. Examples
      1. Magnetic tape
      2. Floppy Disk
      3. Hard Disk Drives
    2. How it works
      1. It is coated with iron oxide.
      2. This oxide is a ferromagnetic material.
      3. As it is a ferromagnetic material, meaning that if you expose it to a magnetic field it becomes permanently magnetized.
  2. Optical
    1. How it works
      1. The spiral bumps on a CD starts in the center. CD tracks are so small that they have to be measured in microns which are millionths