HD is an acronym for ‘high definition’, a digital media format that
provides superior image quality and better image resolution. HD
images are sharp and clear, appearing more like the pictures you
see in a movie theatre.

But why do high definition images look so much better than
standard definition (SD), even to the naked eye? The answer lies
in the composition of a high definition image. Consider that a
typical image is made of a series of small dots, called pixels.
To create a single frame of a picture, the pixels are displayed on the
screen in horizontal lines, which are called scan lines. One frame
of a high definition image contains either 720 progressive scan
lines or 1080 interlaced scan lines, compared to the 525 lines
required to build a standard definition frame. That’s a significant
increase in the amount of detail required to build just one frame
of a high definition image.

HD also produces a lifelike viewing experience because images
are composed in 16:9 widescreen aspect ratio. This ratio
appears rectangular, rather than the square 4:3 aspect ratio
used to build standard definition images. In fact, most featurelength
movies are shot in 16:9 aspect ratio – viewing the movie
in 16:9 format ensures that you get the full picture quality, just as
it was shot.

So what is HD DVD? Simply put, HD DVD is a means of storing
and copying high definition content to DVD media. The increased
picture detail requires more storage space when writing
this data to disc. The 30 GB HD DVD can store up to 8 hours of
1,125 scan line HD images, or up to 48 hours of 525 scan line
SD images. When compared to today’s DVD with a capacity of
4.7 GB, or up to 2 hours of 525 scan line SD images, you can
easily see why HD DVD is the format of the future. Better image
data and more storage space produces an unbeatable entertainment
or multi-media experience.