What is the main reason a DVD can hold more information than a CD, aside from the number of layers of data storage medium?
A) DVD's use polarized light.
B) CD's are diffraction limited
C) DVD's use shorter-wavelength light than CDs
D) CD light is circularly polarized

Question

Quizplus · Accepted Answer

DVDs use shorter-wavelength light (typically 650 nm for DVDs versus 780 nm for CDs), which allows for smaller pits (the marks that store information) and therefore more data to be stored on the same size disc.

What Is the Main Reason a DVD Can Hold More