Computing
Computer Science LearnITWithMrC ⛯ Year 7 Year 8 Year 9 GCSE
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Lesson Video

61

Lesson Tasks

  • Watch the Lesson video
    Make notes if needed.
  • Open your Learning Journal
    Complete Task 1 in your Learning Journal
  • Complete the learning activities
    Make sure you complete the book tasks in your Unit Booklet
  • Complete End of Task Assessment
    Update your learning objectives

What do I need to Learn?

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I need to learn how to understand the differences between main memory and secondary storage
I need to learn how to understand why secondary storage is required and am aware of different types of secondary storage
I need to learn how to explain the operation of solid state, optical and magnetic storage and discuss the advantages and disadvantages

Key Terms

Magnetic hard disk Actuator (motor) Drive arm Drive read/write head Magnetic platter (disk) Spindle (motor) pit land Drive head Solid State Disk Optical storage Blu-ray disk Laser Lens Secure Digital (SD) card USB Drive

Task 1 - Getting organised Click to see more


Task: Learning Journal

Open your Learning Journal by clicking on the image below

Good notes will help you organise and process data and information


Task 2 - Secondary storage Click to see more

Secondary storage (often also called auxiliary storage) is anything that stores data other than the temporary storage in things like RAM. In a personal computer, secondary storage usually consists of a hard disk and removable media.

Hard Disk

Optical Devices

External storage is also secondary storage. External secondary storage devices are used to:

  • back up data
  • add more storage space for files, photographs, videos, and so on
  • transfer files between computers
  • easily transport files without taking your computing device with you
  • share files over a network.

Different types of non-volatile secondary storage include the following:

  • magnetic storage
  • optical storage:
    • compact disk (CD)
    • digital versatile disk (DVD)
    • Blu-ray disk (BD)
  • solid-state disk
  • USB drive (memory stick or pen drive)
  • flash memory card.

Task:

Open your student workbook at page 46 Read through the notes then complete the following task in your book.
  1. Task 24

  • When you are finished screenshot your answer into your Learning Journal

  • Task 3 - More Questions Click to see more

    Exam Question

    1. In your own words explain the purpose of secondary storage and why it is necessary in a computer system.
    2. Computers in the 1990’s had a hard disc capacity of 4-8Mb. This was sufficient to store all the programs and data. In today’s market, on a typical home computer, what is the average capacity available for:
      1. HDD
      2. SSD
      3. Portable HDD