Despite the fact that both Compact disc and Digital video disks have a similar  media shape and size, whatever they have in  common finishes there.  You will find a variety of  things between your two, for example the things they hold  and just how much they hold.  Data starts and lasers  A disc has microscopic grooves which will move  along inside a spiral round the disc.  Compact disks and  Dvd disks have these grooves, with laser breams  put on scan these very grooves.  To be sure, digital details are symbolized  in ones and zeroes.  Within these dvds, very  small reflective bumps referred to as lands and non  reflective holes referred to as starts, which may be  found near the grooves, reflect both ones  and also the zeroes of digital information.  By reduction of the wave entire laser to 625mm  or even more infrared light, DVD technologies have  handled to create in more compact starts when in comparison  towards the standard technology of Compact disc.  This can  permit more data per track  around the DVD.  The minimum length permitted for any  pit in one layer DVD-R is .4 micron, which  is clearly a lot more than the .0834 micron that the  Compact disc offers.  The tracks of the DVD are narrower too, which  enables for additional tracks per disc, that also  means more capacity than the usual Compact disc.  The  avaerage single layer DVD holds 4.5 GB of information,  while a Compact disc holds only 700 Megabytes.  Layers  As mentioned above, a DVD has more compact starts and also the  lasers need to pay attention to them.  This really is really  accomplished using a thinner plastic substrate  compared to a Compact disc, meaning the laser needs  to feed a thinner layer, with less  depth to achieve the starts.  It's this decrease in  thickness that's accountable for the dvds  which were only .6mm thickness - that is half  what Compact disc.  Data access speed  Dvd disks will access data in a considerably faster rate than  a Compact disc can.  The typical 32X Compact disc-ROM drive reads  data at 4MB another, while a 1X DVD drive reads  at 1.38MB another.  This really is even faster than  an 8X Compact disc drive.  Universal data format  It formats of Compact disks and Dvd disks are very  different, as Dvd disks use UDF, or even the Universal  Data Format.  This format enables data, video,  audio, or perhaps a mixture of the 3 to  be saved in one file structure.  The  benefit to this really is any file could be utilized  by any drive, computer, as well as consumer video.  Compact disks however aren't suitable for  this format.

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