Year 10
Year 10

Optical and magnetic storage

Lesson details

Key learning points

  1. In this lesson, we will build on what we learnt in the previous 'Secondary Storage' lesson; this lesson involves exploring optical and magnetic storage devices. We will learn how each type of storage operates, and explain how data is written and read from each device. We will then actively rank the storage device in a number of key areas of comparison.


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5 Questions

Which features of RAM make it unsuitable for long term storage? (Select all that apply)
Correct answer: It has a small capacity
It is fast to read & write
Correct answer: It is not portable
Correct answer: It is volatile
What features of ROM make it unsuitable for long term storage? (Select all that apply)
Correct answer: It can only be read from and not written to
Correct answer: It has a tiny capacity
It is non-volatile
Correct answer: It is not portable
What are the three categories of secondary storage?
Optical, Plastic and the Cloud
Correct answer: Solid state, Optical and Magnetic
The Cloud, Magnetic and Plastic
The Cloud, Optical and Solid state
Solid state drives are fast to read and write and take less energy to run than other devices. Which feature allows them to do this?
Correct answer: No moving parts
The storage capacity
Their physical size
They are silent when running
Which device has faster read and write speeds?
Correct answer: RAM
Solid state storage

6 Questions

Optical storage uses light to store data on discs. What device does it use to mark the discs?
A chisel
Correct answer: A laser
A light bulb
A magnet
The marks and gaps on an optical storage disc are called...
Dots and dashes
Peaks and troughs
Correct answer: Pits and lands
Ups and downs
Magnetic storage also uses discs to store data. What are the discs inside a hard-drive called?
Correct answer: Platters
Magnetic hard-drives use moving parts to store and read data. Which parts of a hard-drive move when it is operating? (Select all that apply)
Correct answer: The discs
The outer casing
The output connector
Correct answer: The read/write head
When comparing storage devices you should be able to comment on the cost per GB of each type. Which type of storage is the most expensive?
Correct answer: Solid state
They are all the same
Which type of storage typically has the largest capacity? (Can hold the most data)
Correct answer: Magnetic
Solid state
They are all the same