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| Sep 26, 2008 - Increased compatibility: DVD bitsetting - Explanation - 02 |
Difference between DVD-R and DVD+R
Physically there is a difference between a DVD-R disc and a DVD+R disc that is made during the production process. During the production of a DVD-R disc the lead-in is pre-embossed (pre-written). This overwrites parts of the DVD that contains information about the disc. E.g. the CSS key (part of the copy protection) is in this part on commercial movie discs (This is why you can’t make a 1:1 copy of a DVD without other software, RZ DVD COPY can help you do this!). But in this space there is also room reserved for the so called ‘booktype?field.
Changing the booktype field
This booktype field identifies the disc as either a DVD-ROM, DVD+R(W) or a DVD-R(W) disc and is for a big part responsible for the compatibility. Because this setting is overwritten during the DVD-R production process it can’t be modified afterwards, the laser of your DVD recorder simply can’t write to that part of the disc. During the production of DVD+R discs the space is untouched. Still CSS keys can’t be written to DVD+R discs because every DVD recorder and DVD player has a limit in its firmware to write or read to this space. However, there is no limit for writing the booktype field. Therefor a DVD+R(W) recorder will be able to modify this field by sending a command to the DVD recorder and fool the DVD player.
When the booktype field (bitsetting) is changed to DVD-ROM then DVD players are fooled and will think the user has put in a DVD-ROM disc instead of a DVD+R disc and will read it accordingly. This results in an increased chance that the player is able to read the disc and that’s why the ability to change the booktype field (bitsetting) is essential to a lot of users. Certainly owners of a DVD player that requires this field to be set to DVD-ROM, in order to work properly, will prefer a DVD recorder that supports setting the booktype field.
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