A new optical disc format known as the Blu-ray Disc (BD) is becoming popular. In what way is it different from

Question

A new optical disc format known as the Blu-ray Disc (BD) is becoming popular. In what way is it different from the traditional DVD?
1) DVD supports Standard Definition video while BD supports High Definition video.
2) Compared to a DVD, the BD format has several times more storage capacity.
3) Thickness of BD is 2.4 mm while that of DVD is 1.2 mm.
Which of the statements given above is/are correct?

Accepted Answer

Blu-ray discs utilize a blue-violet laser, which has a shorter wavelength than the red laser used by DVDs. This allows for smaller pits and lands on the disc, leading to significantly higher data density and storage capacity. Consequently, Blu-ray can store high-definition video content, whereas DVDs are limited to standard definition. The physical thickness of the discs is actually the same; the difference lies in the data storage technology.