Lesson Plan

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Lesson Plan
Grade: Date: 17/01/2026
Subject: Computer Science
Lesson Topic: Describe the operation of magnetic, optical and solid-state storage with examples
Learning Objective/s:
  • Describe how magnetic storage records data using magnetic domains and the role of read/write heads.
  • Explain the principle of optical storage using pits, lands and laser detection.
  • Outline the operation of solid‑state storage with NAND flash cells and charge storage.
  • Compare capacity, access speed, durability and cost of magnetic, optical and solid‑state media.
  • Evaluate appropriate use‑cases for each storage type.
Materials Needed:
  • Projector or interactive whiteboard
  • Slides with diagrams of HDD, optical disc and SSD
  • Sample storage media (USB flash drive, CD/DVD, hard‑disk image)
  • Worksheet with comparison table and revision questions
  • Whiteboard and markers
  • Laptop with internet access for short video demo
 Introduction:
Begin with a quick poll: “Where do you store your photos and music?” Connect to prior knowledge of hard drives and USB sticks. Explain that today they will explore how magnetic, optical and solid‑state devices store data and the criteria for success.
Lesson Structure:
  1. Do‑Now (5') – Students list storage devices they own on sticky notes and share briefly.
  2. Mini‑lecture (10') – Explain magnetic storage with a diagram of a hard‑disk platter and read/write head.
  3. Guided activity (8') – Small groups label parts of a hard‑disk diagram; teacher checks understanding.
  4. Optical storage demo (10') – Show a short video of a laser reading a DVD and discuss pits/lands.
  5. SSD concept (8') – Explain NAND flash operation using a USB flash drive as example.
  6. Comparison worksheet (12') – Groups fill a table comparing capacity, speed, durability and cost; teacher circulates.
  7. Quick revision quiz (5') – Students answer four revision questions individually.
  8. Exit ticket (2') – Write one advantage of the storage type they find most suitable.
Conclusion:
Summarise the key differences among magnetic, optical and solid‑state storage, emphasizing speed and durability. Collect exit tickets and address any lingering misconceptions. For homework, assign students to research a recent storage technology (e.g., NVMe SSD) and prepare a short paragraph.