Name : Rupali Toke
Roll no. 0008
Blu-ray, The Future Of storage devices
Once one decides on purchasing a TV, an LCD TV, a Plasma TV or one of the top HDTVs
the next in line would most probably be DVD Players. And with CDs and DVDs making
way for Blu-Rays, the race for the top DVD Players has heated up. The Blu-Ray disc or just
BD is an optical disc now widely used because of its great advantages; it can store more data
compared to the standard CDs and DVDs and can record, rewrite and playback high-definition
video.
BD is an optical disc now widely used because of its great advantages; it can store more data
compared to the standard CDs and DVDs and can record, rewrite and playback high-definition
video.
This innovative idea is the brain child of a group known as the Blu-Ray Disc Association,
which includes almost all the top manufacturers of consumer electronics, personal computers
and recording media such as Apple, Dell, HP, LG, Panasonic, Sharp, Samsung, Sony, Pioneer,
Walt Disney Pictures, Thomson and so on. Though today DVDs still rule the roost, Blu-Rays
are not lagging behind. The famous movie studios have released movies on BDs along with
the DVDs. Most of the top manufacturers have come up with DVD players that play Blu-Ray
discs.
which includes almost all the top manufacturers of consumer electronics, personal computers
and recording media such as Apple, Dell, HP, LG, Panasonic, Sharp, Samsung, Sony, Pioneer,
Walt Disney Pictures, Thomson and so on. Though today DVDs still rule the roost, Blu-Rays
are not lagging behind. The famous movie studios have released movies on BDs along with
the DVDs. Most of the top manufacturers have come up with DVD players that play Blu-Ray
discs.
A blu ray disc named after the blue laser used to write the data. The first blue laser was developed in 1996 by Shuji Nakamura( NichiaCorporation)
Blu-ray Disc (official abbreviation BD) is an optical disc storage medium designed to
Supersede the DVD format. The format defines as its standard physical media a 12 cm (same as DVDs and CDs), 25 GB per-layer optical disc, with dual layer discs (50 GB) the norm for feature-length video discs and additional layers possible later. The name Blu-ray Disc refers to the "blue laser” used to read the disc, which allows for six times more storage than on a DVD.
A blu ray disc basically comes in four different formats. The first type is BD –ROM (read only) for reading recoded content, the second type is BD –R (recordable) for PC data storage, the third type is BD – RW (rewritable) for PC data storage and the last type is BD – RE (rewritable) for HDTW (high definition television) recording. The bluray is basically single layer that can hold data up to 25/27 GB that means 2 hrs of HD video or about 13 hrs of standard video and Double Layer that can hold data up to 50 GB that means 4.5 hrs of HD video or more than 20 hrs of standard video.
The technology that is used in the bluray consists of Pits which are Spiral grooves that run from the centre of disc to its edges, Bumps which are other sides of these edges. The Track pitch that is the distance between the two tracks (of pitch) on the surface. The disc Store Digitally encode data in pits so, in blu ray dics Pit size is about 0.15 micron (more than twice as small as the pits on DVD).A Track pitch of 0.32 microns and the Laser Needed is Blue violate laser (405 nm) and the data transfer rate is 36 Mbps. Using double infrared it createsthe wavelength for blue light.A blue laser operates in the blue range of the light spectrum ranging from about 405 nm to 470 nm.Most blue laser diodes use indium gallium nitride as the material to create the laser light.Blue laser beams have a smaller spot size and are more precise than red laser beams which lets data on blue laser optical storage discs be stored more densely.The spot size of a laser beam is one deter mining factor along with the material in the optical disc and the way the laser is applied to the disc in thesize of the pits the laser makes on an optical etc.Laser beams with larger spot sizes typically create larger pits than those with smaller pit sizes
Various hard coating technologies make Blu Ray dics most durable and family friendly.Hard coating technology provides resistance to- Finger Prints,Marks
Scrarches and dust which makes it much more ROBUST than today’s polycarbonate based CD/DVD’S and (HD DVD’).
With BD we can record HDTV without any quality loss,Instantly skip to any spot on disc, record one program recorded on disc, create playlist,edit or reorder programmers recorded on disc,automatically search for an empty space on the disc to avoid recording over a program, access to web to download subtitles and other extra feature.In short it is a multitasking disc that is the future of storage devices.
But Blu-Ray discs will take some more time to gain popularity as it all depends upon how fast the BD format becomes widespread. But that shouldn’t daunt you in checking out the latest BluRay DVD players and seeing the difference between BD and DVD
