Transcript Presentation

How Blu-Ray Discs Work
 Encodes data onto a disc by
creating pits with a laser that can
be read as binary code, just like
CDs and DVDs.
 Uses 405nm blue (actually violet)
laser, while DVDs use 650nm and
CDs use 780nm red lasers.
 The smaller wavelength laser
allows pits to be much smaller
and closer together, allowing
much more data to be recorded
in the same area.
How Blu-Ray Discs Work Cont.
 Data is recorded closer to the surface, eliminating problems of
birefringence and disc tilt
 Hard coating on surface to protect from scratches and fingerprints
Background
 Created by Sony and introduced in 2002, they went on the market in
2006.
 Had big competition from Toshiba's HD-DVDs:
 Based on similar technology,
 Have slightly smaller storage size,
 Their players can also play normal DVDs
 Blu-ray won the format war this spring, but still not very popular
 Prices too high
 Most people satisfied with DVDs
 Blu-ray are finally gaining popularity this fall,
 Prices starting to go down, to under $300 by the holiday season
 More blu-ray movies being released.
Benefits of Blu-ray Discs
 Durable and Accurate
 Increased storage capacity
 5 to 10 x more storage space then a DVD
 More convenient when burning large amount of information
 Better resolution and sound quality
 5 x better resolution then a DVD
 User friendly
 Easy transition from DVD to Blu-Ray
Criticisms of Blu-ray Discs
 HD-DVDs provide comparable storage and could be manufactured
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with the same equipment used to produce DVDs, saving on costs.
Blu-ray players are significantly more expensive than HD-DVD players.
HDTV required to fully utilize HD content on Blu-ray
DVDs are still good enough
First generation technology is prone to bugs and glitches
Blu-ray discs have playback problems due to an issue with the Sony
BDP-S1 players’ handling of BD-J, the interactive Blu-ray Java
specifications.
Through the use of better codec technology, the space on Blu-Ray discs
is not actually needed for high-definition movies.
Opinion
 We support the use of Blu-ray
technology because its large
capacity will be necessary to
satisfy the ever growing demand
for data storage as HD content
becomes more prevalent and
publishers include more features.
 However, we recommend waiting
until second generation players
are released and prices drop.
 Also, HD-DVD already lost.