Blu Ray Disc Technology

History Blu-Ray Disc Working The Technology Advantages Disadvantages On Guard To Do More With

Table Of Contents

First Generation

When the CD was introduced in the early 80s, it meant an enormous leap from traditional media.

Not only did it offer a significant improvement in audio quality, its primary application, but its 650 MB storage capacity also meant a giant leap in data storage and retrieval.

For the first time, there was a universal standard for prerecorded, recordable and rewritable media, offering the best quality and features consumers could wish for themselves, at very low costs.

History :-

Second Generation Although the CD was a very useful medium for the

recording and distribution of audio and some modest data .applications, demand for a new medium offering higher storage capacities rose in the 90s.

These demands lead to the evolution of the DVD specification and a five to ten fold increase in capacity.

This enabled high quality, standard definition video distribution and recording. Furthermore, the increased capacity accommodated more demanding data applications.

History:-

HDTV (High Definition Video) :

It is also possible to capture video using inexpensive webcams. These normally connect to a computer via USB.

While they are much cheaper than DV cameras, webcams offer lower quality and less flexibility for editing purposes, as they do not capture video in DV format.

Digital video is available on many portable devices from digital stills cameras to mobile phones.

This is contributing to the emergence of digital video as a standard technology used and shared by people on a daily basis.

History:-

MPEG :MPEG, the Moving Picture Experts Group, overseen by the International Standards Organization (ISO), develops standards for digital video and was designed specifically for Video .

MPEG .1 audio player .3 (MP3) compression evolved from early MPEG work. MPEG1 is an established, medium quality format supported by all players and platforms. Although not the best quality it will work well on older specification machines.

MPEG .2 is an excellent format for distributing video, as it offers high quality and smaller file sizes .Despite this, MPEG2 is becoming more common as a capture format.

History:-

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.

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.

Unlike a DVD which uses a red laser the blu ray uses a blue laser. This blue laser has a shorter wave length.The beam is more precise and can read the grooves on the blu ray disc which are made twice as small as the ones on a regular DVD.

This is why the blu ray disc can hold so much data and contains so many new features.

For these reasons, the blu-ray disc will probably become the medium of choice for the foreseeable future , until something better comes along.

Working

Comparison in Beam size

THE TECHNOLOGY Pits: spiral groves that runs from the center of the disc to its edge.

Track pitch: it is the distance between the two tracks (of pits) on the surface.

----------------------------------------------------------Disc store digitally encoded data in PITS. ----------------------------------------------------------

THE TECHNOLOGY So, in blu-ray disc:

Pit size-- 0.15 microns (more than twice as small as the pits on DVD). Track pitch– 0.32 microns

laser needed:-- blue-violet laser (450nm) Data transfer rate: 36Mbps

Blu-ray Density Advantage

Higher density enables better data seek times.

Shorter to travel for same amount of data results in the faster data seek.

Better for random access of data.

Technology CapacityGB

Speed AccessTime

ArchiveLife

PowerConsumption

SpecialRequirements

CostGB

Blu-ray 50 Good V Good 50 Low No High

PlasmonUDO

30 Average

Good 50 Low No Highest

DVD 4.7/9.4 Poor Average

50 Low No Low

TAPE >800 V Good V Poor 30 Medium No Low

RAID >1TB Excellent

Excellent

2 High Needs backing up

Low

Storage Technology

Format of BD It comes in four different formats: 1. BD-ROM (read only): for reading recorded

content. 2. BD-R (recordable): for PC data storage. 3. BD-RW (rewritable): for PC data storage.

4. BD-RE (rewritable): for HDTV (high definition television) recording.

TYPES OF BD SINGLE LAYER:

can hold data up to 25/27 GB that means 2hrs of HD video or about 13hrs of standard video. DOUBLE LAYER: can hold data up to 50 GB that means 4.5hrs of HD video or about 20hrs of standard video.

Comparison in building BD AND DVD BD

Data is placed on top of a 1.1 mm thick polycarbonate layer. Doesn’t suffer from BIREFRINGENCE. Doesn’t suffer from Disc Tilt.

Hard coating is placed outside to protect from scratches or fingerprints.

DVD

Data is sandwiched b/w two polycarbonate layers, each 0.6 mm thick.

Suffer from BIREFRINGENCE. Suffer from Disc Tilt.

No such hard coating is placed.

Huge storage capacity series Although Blu-ray can't quite fit an entire of HD-

quality material on one disc, it could potentially fit an entire series of standard DVD quality stuff on one. That's pretty good, considering the storage savings alone.

Quality support :Sony and Philips might be the strongest backers of Blu-ray, but other major corporations have announced future plans to support the technology. Some of these include Apple, Dell and Panasonic.

Advantages:-

Backwards compatibility :The Blu-ray Disc Association is encouraging manufacturers to make the players fully backwards compatible. That will allow users to both read and write on CDs, DVDs, and, obviously, Blu-ray discs.

Advantages

That cost Movie support, thus far The competition The cost of films.

Disadvantages:-

On Guard

Blu-ray discs are better armed than current DVD’s. They come equipped with a secure encryption system – a unique ID that protected against video piracy and copyright infringement.

Do More With… More capacity , Density and Performance. More Industry Support/Consumer Reach. More Durable.

More interactive user experience.

More flexible content protection.

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