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Blu-ray Disc, Blu-ray Media |
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What is Blu-ray?
Blu-ray, also known as Blu-ray Disc (BD) is the name of a next-generation optical disc format.
The format was developed to enable recording, rewriting and playback of high-definition video (HD), as well as storing
large amounts of data. The format offers more than five times the storage capacity of traditional DVDs and can hold up to
25GB on a single-layer disc and 50GB on a dual-layer disc. For more general information about Blu-ray.
How much data can you fit on a Blu-ray disc?
A single-layer disc can hold 25GB. A dual-layer disc can hold 50GB.To ensure that the Blu-ray
Disc format is easily extendable (future-proof) it also includes support for multi-layer discs, which should allow the
storage capacity to be increased to 100GB-200GB (25GB per layer) in the future simply by adding more layers to the discs.
How much video can you fit on a Blu-ray disc?
Over 9 hours of high-definition (HD) video on a 50GB disc.
About 23 hours of standard-definition (SD) video on a 50GB disc.
How fast can you read/write data on a Blu-ray disc?
According to the Blu-ray Disc specification, 1x speed is defined as 36Mbps. However, as BD-ROM
movies will require a 54Mbps data transfer rate the minimum speed we're expecting to see is 2x (72Mbps).
Blu-ray also has the potential for much higher speeds, as a result of the larger numerical aperture (NA) adopted
by Blu-ray Disc. The large NA value effectively means that Blu-ray will require less recording power and lower disc rotation
speed than DVD and HD-DVD to achieve the same data transfer rate. While the media itself limited the recording speed in the
past, the only limiting factor for Blu-ray is the capacity of the hardware. If we assume a maximum disc rotation speed
of 10,000 RPM, then 12x at the outer diameter should be possible (about 400Mbps). This is why the Blu-ray Disc
Association (BDA) already has plans to raise the speed to 8x (288Mbps) or more in the future.
What video codecs will Blu-ray support?
MPEG-2 - enhanced for HD, also used for playback of DVDs and HDTV recordings.MPEG-4 AVC - part
of the MPEG-4 standard also known as H.264 (High Profile and Main Profile).
SMPTE VC-1 - standard based on Microsoft's Windows Media Video (WMV) technology. Please note that this simply means that
all Blu-ray players and recorders will have to support playback of these video codecs, it will still be up to the movie
studios to decide which video codec(s) they use for their releases.
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