3683477
Description
Mind Map by James Hawksley, updated more than 1 year ago
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Created by James Hawksley
about 9 years ago
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Computer Hardware
- Devices
- Input
- Output
- Hybrid
- Assistive Technology
- Input
- Secondary Storage
- Purpose
- Non-volatile device that holds data until it is deleted or overwritten.
- Secondary storage is about two orders of magnitude cheaper than primary storage.
- Non-volatile device that holds data until it is deleted or overwritten.
- Types
- Magnetic
- Examples
- Magnetic
tape
- Floppy
Disk
- Hard Disk Drives
- Magnetic
tape
- How it works
- It is coated
with iron
oxide.
- This oxide is a
ferromagnetic
material.
- As it is a ferromagnetic material,
meaning that if you expose it to a
magnetic field it becomes permanently
magnetized.
- It is coated
with iron
oxide.
- Examples
- Optical
- How it works
- 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
- 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
- How it works
- Magnetic
- Purpose
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