Blu-ray Disc (also known as Blu-ray or BD) is an optical disc storage media format. Its main uses are high-definition video and data storage. The disc has the same dimensions as a standard DVD or CD.

The name Blu-ray Disc is derived from the blue laser (violet coloured) used to read and write this type of disc. Because of its shorter wavelength (405 nm), substantially more data can be stored on a Blu-ray Disc than on the DVD format, which uses a red (650 nm) laser. A dual layer Blu-ray Disc can store 50 GB, almost six times the capacity of a dual layer DVD.

Media type：High-density optical disc
Encoding： MPEG-2, MPEG-4 AVC (H.264), and VC-1
Capacity： 25 GB (single layer)
50 GB (dual layer)
Read mechanism：405 nm laser:
1× at 36 Mbit/s
2× at 72 Mbit/s
4× at 144 Mbit/s
6× at 216 Mbit/s
12× at 432 Mbit/s
Developed by Blu-ray Disc Association

Usage： Data storage,
High-definition video
and PlayStation 3 games

Blu-ray utilizes the Advanced Access Content System (AACS). This system is designed to prevent illegal copying of  DVDs and it’s inclusion is mandatory on all Blu-ray discs. As with Macrovision for SD DVDs, AACS has licensing and royalty fees. There’s an AACS per title fee $1600, mastering fees, and other miscellaneous fees. 

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