Blu-ray Disc was developed by the Blu-ray Disc Association, a group of companies representing consumer electronics, computer hardware, and motion picture production. The standard is covered by several patents belonging to different companies. Blu-ray Disc (Blu-ray or BD) is an optical disc storage media format. Its main uses are high-definition video and data storage.
A single-layer Blu-ray disc, which is roughly the same size as a DVD, can hold up to 27 GB of data -- that's more than two hours of high-definition video or about 13 hours of standard video. A double-layer Blu-ray disc can store up to 50 GB, enough to hold about 4.5 hours of high-definition video or more than 20 hours of standard video.
VHS: analog DVD: digital BD: high-definition
Enables recording, rewriting, and playback of high-definition video
Capable of storing information that the DVD and CD are not capable of holding
The Name The Blu-ray name is a combination of "blue," for the color of the laser that is used, and "ray," for optical ray. The "e" in "blue" was purposefully left off. The name Blu-ray Disc is derived from the blue-violet laser used to read and write this type of disc.
The Details Data storage, High-definition video and PlayStation3 games Usage Blue-ray Disc Association Developed by 405 nm laser, 1x@36 Mbit/s 2x@72 Mbit/s 4x@144 Mbit/s 6x@216 Mbit/s 12x@432 Mbit/s Read mechanism 25 GB (single layer) 50 GB (dual layer) Capacity MPEG-2, MPEG-4 AVC (H.264), and VC-1 Encoding High-density optical disc Media type
Structure of the Disc
The BD Allows to…
record high-definition television (HDTV) without
any quality loss
instantly skip to any spot on the disc
record one program while watching another on
edit or reorder programs recorded on the disc
automatically search for an empty space on the
disc to avoid recording over a program
access the Web to download subtitles and other
Formats Unlike DVDs and CDs, which started with read-only formats and only later added recordable and re-writable formats, Blu-ray is initially designed in several different formats: BD-ROM (read-only) - for pre-recorded content BD-R (recordable) - for PC data storage BD-RW (rewritable) - for PC data storage BD-RE (rewritable) - for HDTV recording Java Software Support
Java is used to implement the interactive menus on BD