Computer Science for IGCSE & O level - Hardware (Section 6 - No. 5)
What is the main difference between the operation of CDs, DVDs, and Blu-ray discs?
The type of laser light used, and the track spacing.
The physical size of the disc.
The recording speed.
The format of the data stored.
Selitys
The main differences are related to laser wavelength and the track density.