Secondary Storage

Secondary Storage

Magnetic Hard Disks:

• Form of secondary storage device.
• Consist of multiple platters or disks that are coated in a magentic material.
• 1 minute rotates 7200 times.
• Written in bits onto the surface as a series of changes in direction of magnetisation.
• Changes are detected and that's how tha data is read back.
• Hard disk can hold anything between 200GB and 1 TB of data.
• Advantages:
  • Large amounts of data can be stored.
  • Work is not lost when you turn off the computer.
  • Relatively cheap per MB - compared to other storage devices.
• Disadvantages:
  • Relatively slow compared to ROM AND RAM.
  • If it crashes it stops the whole computer from working.
  • Fixed in place on the mother board -…