Lesson Plan

• Describe the basic components and operation of CD, DVD and Blu‑ray drives.
• Compare the laser wavelengths, capacities and data‑rates of CD, DVD and Blu‑ray formats.
• Explain how layering and pit size affect storage capacity.
• Identify typical applications and advantages/disadvantages of each optical medium.
• Apply knowledge by completing a revision checklist of key concepts.

• Projector and screen
• Laptop with presentation slides
• Sample optical discs (CD, DVD, Blu‑ray)
• Handout with comparison table
• Whiteboard and markers
• Exit‑ticket slips

Begin with a quick question: “What media have you used to store music, movies or games?” Capture responses, then link to the evolution from CD to Blu‑ray. State today’s success criteria – students will be able to identify key differences and explain why newer formats store more data.

1. Do‑Now (5’) – Students list any optical media they own on a sticky note.
2. Mini‑lecture (10’) – Overview of optical drive components and how lasers read/write pits.
3. Interactive comparison (12’) – Show side‑by‑side slides of CD, DVD, Blu‑ray specs; students fill a Venn diagram on the handout.
4. Hands‑on demo (10’) – Examine real discs; discuss layer count and capacity.
5. Guided practice (8’) – Small groups answer the “Revision Checklist” questions using the handout.
6. Check for understanding (5’) – Quick quiz via Kahoot or show of hands on key facts.
7. Wrap‑up (5’) – Teacher summarises main points; students write one takeaway on exit ticket.

Recap the three formats, highlighting how laser wavelength and layering drive capacity and speed. Collect exit tickets to gauge retention and assign a short homework: create a table comparing CD, DVD and Blu‑ray for a future revision.