A new optical disc format known as the Blu-ray disc is becoming popular. In what way is it different from the traditional DVD?
- DVD supports standard definition video while Blu-ray disc supports high-definition video.
- Compared to a DVD, the Blu-ray disc format has several times more storage capacity.
- Thickness of Blu-ray discs is 2.4 mm while that of DVD is 1.2 mm.
Which of the statements given above is/are correct?
- 1 only
- 1 and 2 only
- 2 and 3 only
- 1, 2 and 3
Explanation
Statement 1 is correct
- Blu-ray (Blu-ray Disc or BD) is a digital optical disc data storage format designed to supersede the DVD format. It was invented and developed in 2005 and released worldwide on June 20, 2006, capable of storing several hours of high-definition video (HDTV 720p and 1080p).
Statement 2 is correct
- A standard DVD holds about 4.7 GB, whereas a single-layer Blu-ray disc holds 25 GB, and a dual-layer Blu-ray can hold up to 50 GB, which is several times more.
Statement 3 is incorrect
- Both Blu-ray and DVD discs have the same overall thickness of 1.2 mm.
