Blu-ray DVD Players - HD-DVD Players
Echoing the format debates over VHS and Beta of the 1980s, HD-DVD and Blu-ray supporters are touting their own
technology and running down the other. However, what is in that for you, the consumer. Provided you will be able to
obtain any movie or other content you want, it matters very little. To help you decide here is some information on
the two formats, along with the pros and cons of each.
Ordinary CDs and DVDs use a laser that produces red light, whose wavelength is about 650nm, a little more than
half a micron. Blu-ray and HD-DVD units use a blue light laser, with wavelength of 405nm which is a little less
than half a micron. That tiny difference in wavelength makes a large difference to many people.
Standard DVDs can hold about 4.7GB of data. That data can be computer documents or thanks to clever software
movies or audio. That permits storing a two hour film and a few extras to display on standard TV sets. It is not
nearly enough to store a high definition film to show on a 720p or 1080i or 1080p HDTV set.
The number refers to the number of lines of pixels on the screen, the 'i' or 'p' indicates whether those lines
are painted in two passes - every other line interlaced - or progressively in one pass. 1080p has the best picture,
all other things being equal.
Blu-Ray vs HD-DVD
Blu-ray and HD-DVD can both store enough data for a HD film and extras. The HD-DVD can store up to 30GB using
dual layer discs and Blu-ray up to 50GB or more. Both achieve this by using smaller pits in the aluminum disc,
spaced closer together in spirals layed out from the center to the edge.
A smaller wavelength laser is required, due to some interesting physics of waves, to 'read' the more closely
spaced pits. Some 100GB discs and players are under development using four layers inside a single disc. That could
store 10 years of standard TV episodes on a single disc.
Though important for computer applications, the different storage capacities mean little to consumers interested
primarily in watching HD films and other on disc content. Either will display the same quality image on an HDTV.
Both will offer far superior audio compared to today's DVD's.
That being said, there is behind the scenes activity that does make a difference to consumers.
Most of the major studios are lined up to deliver Blu-ray format content, though some are supporting both.
HD-DVD players and some content are now available and the machines are currently priced about half ($500) the
anticipated prices of Blu-ray DVD players. Blu-ray DVD players are expected to launch in the summer of 2006. Either
format will play a standard DVD.
This time, Sony, makers of both Beta and Blu-ray, seem determined not to repeat the experience of the 1980s.
They have lined up a great many large company supporters, including Panasonic, Samsung and others.
Toshiba, originators of HD-DVD, Hewlett-Packard, Microsoft and others are pushing HD-DVD. The advantages are
much less need to modify existing disc duplication equipment and other technical factors.
It is too early to tell which format will win out, or whether they will both carve a large enough niche with
consumers to remain viable. It is likely at this stage that Blu-ray will win out for films and HD-DVD for PCs, but
it is too soon to be sure. Much will depend on costs and available content over the coming years.