Question

DVDs store data using ___ .

Multiple Choice
a.a reflective coating that has pits and lands
b.electronic circuits
c.a magnetic coating that is sensed by a read/write head
d.a blue spectrum laser beam

Answer 1

DVDs store data using a reflective coating with pits and lands that are read by a laser beam.

Step-by-step explanation:

DVDs store data using a reflective coating that has pits and lands.

These pits and lands on the DVD are read by a laser beam, which is reflected differently depending on whether it hits a pit or a land. The laser beam then detects the changes in reflection and converts them into binary code, representing the data on the DVD.

For example, when the laser beam hits a pit, it scatters and reflects less light, indicating a 0, whereas when it hits a land, it reflects more light, indicating a 1.