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DVD/Micro
What’s the basic difference between DVD and CD?
DVD is a high capacity multimedia data storage medium. It can accommodate a complete movie on a single disc, content rich multimedia or very high quality multi-channel audio. At present we use DVDs that are 4.7 gigs in capacity (enough for 2 hours of video footage including sound). The typical CD using 700 megs.
For a complete guide to the differences between CD and DVD click here
How does DVD technology differ from CD?
Like CDs, DVDs store data in microscopic grooves running in a spiral around the disc. All DVD drive types use laser beams to scan these grooves: Minuscule reflective bumps (called lands) and nonreflective holes (called pits) aligned along the grooves represent the zeros and ones of digital information.
But that’s where the similarities end. DVDs use smaller tracks (0.74 microns wide, compared to 1.6 microns on CDs) as well as new modulation and error correction methods. These technologies allow them to store data seven times as large as that of a CD. The narrow tracks require special lasers–which can’t read CD-ROMs, CD-Rs, CD-RWs, or audio CDs. DVD drive makers managed to solve the problem.
What’s the storage capacity of DVD?
A DVD can store over two hours of video on one layer of the disc. A CD can store just 74 minutes of data — just enough to hold Beethoven’s Ninth Symphony.
Why is DVD video superior to that of standard videotape?
DVD video storage provides resolution which is far greater than that offered by laser disc media and almost twice the resolution of standard VHS videotape.
This resolution is dependent on the capabilities of the television monitor used, but you need not have a new monitor to enjoy the benefits of DVD. DVD video also provides low noise.
One more advantage is that a DVD disc is not physically touched while it spins in the player, so there is no wear and tear or loss of fidelity over time. In contrast, videotapes do touch a playback mechanism and eventually break down, degrading the quality of picture.
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