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Blu-ray Disc (BD) is an optical storage media format with the high capacity and performance designed for high definition (HD) video and audio. The disc size and shape is as same as the standard CD or DVD, but has a room for much larger amount of data and is capable of higher quality image and audio than any other media format.
Blu-ray discs have smaller pits to encode the data that are packed closer together than CDs or DVDs. The higher number of pits translates to a larger capacity for the disc. These smaller areas of data can then be read by a shorter wavelength blue laser, which is where the name "Blu-ray" comes from.
A single-layer BD is capable to hold over 5 times the capacity of a standard DVD, up to 25 GB of data. For video users, this translates to 11 hours of Standard-definition (SD) video, or approximately 4 hours of HD video on a disc. Dual-layer BD discs can hold up to 50 GB.
Blu-ray is a format created for high capacity data and high definition video. Here are features that Blu-ray discs are capable of that DVDs are not:
Superior resolution is a big part of what makes Blu-ray look great. This means you'll see a more detailed image: more clearly defined wrinkles in clothing, strands of hair, etc. The technical difference is that Blu-ray's maximum resolution is 1,920x1,080, while DVD is limited to 720x480. Beyond resolution, Blu-ray also uses better video-compression methods, resulting in more contrast and richer colors. It's the highest-quality video format available today, and in some ways it surpasses the picture quality of your local movie theater, especially when shown on a good-performing HDTV or projector.If you like the way HD from your cable or satellite provider looks, Blu-ray looks even better.
New high-resolution soundtrack formats, such as Dolby TrueHD and DTS-HD Master Audio, are identical to the studio master, so you'll be hearing things exactly as the director and audio engineers intended.
The most basic alteration is the pop-up menu, which allows you to control the menu functions while the movie continues playing. Other alterations include picture-in-picture video commentary and the ability to download new content right from your Blu-ray player, although your player needs to have the right Blu-ray profile to access these features.
A standard or dual-layer BD is read at 4.29MB per second, which is roughly 3x the speed of a DVD and 29x the speed of a CD. BD discs also burn at the same speed. Produplicator BD copiers' burning speed is now up to 12X BD-R/ BD-R DL. Burning speeds are adjustable for user's purpose.
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