The main difference between Blu-ray and DVDs

Although blu-ray disc are the same physical size of a DVD or CD, they are capable of storing
and reading much more data. The reason behind this is its use of a blue laser as opposed to the
red laser used by DVDs and CDs. The blue laser has a shorter wavelength, a smaller aperture
lens and a thinner cover layer on the disc that makes it possible to create a smaller beam spot
size capable of storing and reading much more data on the disc.

Of course, no discussion would be complete without mentioning the very heated battle between
the two opposing technologies: Blu-ray vs. HD-DVD. Each disc format have major backers,
behind Blu-ray stands Sony, Dell, Hitachi, Hewlett-Packard, Panasonic, Pioneer, Philips,
Samsung… and backing HD-DVD we have Toshiba, NEC and some major movie studios
Universal Studios, Paramount Pictures, Warner Bros and New Line Cinema.
While many believe Blu-ray has won the battle and will probably become the dominant high
definition technology. (Beta anyone?) The main argument being storage space, since Blu-ray
offers 25 GB for single-layer and 50 GB for dual-layer; this is compared to HD-DVD which gives
15 GB for single-layer and 30 GB for dual-layer.

This is Blu-ray’s strongest playing card, a single layer Blu-ray disc can hold 25 GB of
data. This is compared to the 4.5 GB on a standard DVD. As mentioned before, a
dual layer Blu-ray disc can hold 50 GB. This amount of storage allows the disc to
capture a full 1080p High Definition image. It has a resolution of 1920 by 1080
progressively scanned pixels. A standard DVD has 720 by 480 pixels. Another benefit of the Bluray
disc is it has a much wider bandwidth than a DVD. It can produce signals at speeds up to 48
Mbps. This is 6 times quicker than DVD’s 8 Mbps.

Furthermore, remember your old DVD’s will not be obsolete, as Blu-ray players can play
DVD’s. Blu-ray players can upscale regular DVD’s standard definition images and convert them
to a higher resolution which is needed on a HDTV. This process greatly increases picture
quality, although it doesn’t actually increase resolution. The quality of the players up scaling
function is often the determining factor in the quality of the image that is converted.
Considering all these points and features, the future of Blu-ray looks very bright indeed. Blu-ray
discs and players will probably be around for quite some time or until another more advanced
technology takes its place! But for now, we can all fully enjoy the superior performance and
visuals Blu-ray offers us.

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