Ray and DVD?
Blu-Ray discs have more storage capacity — a
LOT more. A standard DVD holds 4.7
Gigabytes of data. This is enough to hold one
movie. If that movie is longer than two hours,
you need two DVDs, or a double-layer DVD
that can store around 9GB. On the other
hand, a double-layer Blu-Ray disc can hold a
massive 50 GB of data.
Image resolution just means how your picture
looks when you are viewing the disc, which is
usually all people really care about. Blu-Ray
easily wins this battle, too. A DVD is a standard
definition device. You won’t get high-definition
movie viewing on your DVD, just 480 SD. On
the other hand, Blu-Ray is made for HD, and
you’ll get the best picture possible, with 1080
HD capability for your Blu-Ray movies.
Both DVD and Blu-Ray players use lasers to
read the discs. The difference is that the
DVD laser is a red laser that works at a
650nm wavelength. The Blu-Ray laser is —
you guessed it — blue, and works on
shorter 405nm wavelengths, meaning they
can read information more closely and
To the naked eye, DVDs and Blu-Ray
discs look exactly the same, but the
Blu-Ray’s grooves are much closer
together and thinner since the blue
laser is able to read more precise data.
This is what enables the Blu-Ray disc
to store so much more information.
Blu-Ray discs are also more scratch-
resistant than DVDs.
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