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. The thickness of BD is 2.4 mm while that of DVD is 1.2 mm. Which of the statements given above is/are correct?

QUESTION

Medium

Science & Technology

Prelims 2011

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?

DVD supports Standard Definition video while BD supports High Definition video.
Compared to a DVD, the BD format has several times more storage capacity.
The thickness of BD is 2.4 mm while that of DVD is 1.2 mm.

Which of the statements given above is/are correct?

Select an option to attempt

Explanation

Statement 1 is correct: DVDs are designed for Standard Definition (SD) video, whereas Blu-ray Discs (BD) were developed to support High Definition (HD) video (up to 1080p) and higher audio quality.

Statement 2 is correct: A standard single-layer DVD has a storage capacity of 4.7 GB, while a single-layer Blu-ray disc can hold 25 GB. This means BD offers more than five times the storage capacity of a standard DVD.

Statement 3 is incorrect: Both Blu-ray Discs and DVDs have the exact same physical thickness of 1.2 mm. The primary physical difference is the protective layer; in a BD, the data is closer to the surface (0.1 mm) compared to a DVD (0.6 mm), but the total disc thickness remains the same.

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