A company stores films on optical media.
Identify the optical storage medium that can store the most data.
Mark scheme
- A Blu-ray Disc (1)
- The only correct answer is A. The correct answer is Blu-ray Disc.
- B is not correct because a CD stores less data than a Blu-ray Disc, up to about 700 MB
- C is not correct because a DVD stores less data than a Blu-ray Disc, up to about 4.7 GB (single-layer) or 8.4 GB (dual-layer)
- D is not correct because magnetic tape is not an optical storage medium
Example answers and how they were marked
Full marks1/1
A Blu-ray Disc
Why: Correct option (1): a Blu-ray Disc has the greatest capacity of the optical media.
No marks0/1
C DVD
Why: Near miss scoring 0: a DVD is optical but stores less than a Blu-ray Disc (mark scheme line C). Only A is credited.
No marks0/1
D Magnetic tape
Why: Misconception scoring 0: candidates pick tape for its large capacity but magnetic tape is not an optical storage medium (mark scheme line D).