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DVD recordable Media
With the advent of the DVD recorder the media producers are cranking out all sorts of DVD writable or re-writable disks. But what makes them different and why ?
Formats
DVD recordable disks come in a number of formats. First of all there is the DVD-R. This is the original recordable DVD disk. Later came the DVD-RW which is the DVD-R's re-writable counterpart. The emergence of the DVD+ standard brought 2 new disks : DVD+R and DVD+RW. And then there is still DVD-Ram. Below is a table of these formats and what distinguishes them from each other
* = double sided disc.
** - double sided and only 8 cm diameter instead of the usual 12cm.
The reflectivity is a measure for the level of difference between a one and a zero. Because of the way the re-writable media are working the reflectivity is lower making them harder to be read. That explains why cheap video players have trouble with the re-writable media , and less trouble with the write once media. Older drives are less sensitive then the newer ones and thus have problems reading the rewritables. Often they don't detect a dic at all , or suffer from a lot of signal corruption and thus reject the disc.
Disk Structure
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