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afterdawn.com > forums > archived forums > hd dvd discussion > physical differences between hd dvd and dvd media
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Physical differences between HD DVD and DVD media
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schoenike
Newbie
_ 		16. January 2007 @ 16:41 _ Link to this message    Send private message to this user   
Are there any physical differences between burnable HD DVDs and DVD-Rs? If not could a HD DVD burner be tricked into using its blue laser on a DVD-R to store 15 GB of data on a 4.7 GB disc. It would sure be an economical way to store large amounts of data.
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eatsushi
Senior Member

3 product reviews
_ 		17. January 2007 @ 06:25 _ Link to this message    Send private message to this user   
I think both have the data layer 0.6 mm from the surface so theoretically...

However, I wouldn't trust any important data to this.
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JoeRyan
Senior Member
_ 		19. January 2007 @ 12:10 _ Link to this message    Send private message to this user   
Although the physical construction is the same (two sandwich layers), the dye is very different and so is the recording method and directory structure. The 405 nanometer near ultra violet recording laser will not be able to record properly on dye tuned to the 650 nanometers of ruby red laser power. Even if it could, it would have to follow the wobble tracking groove of the DVD.
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BurningAs
Senior Member

1 product review
_ 		21. January 2007 @ 09:28 _ Link to this message    Send private message to this user   
Originally posted by eatsushi:
I think both have the data layer 0.6 mm from the surface so theoretically...

However, I wouldn't trust any important data to this.
dont know if thats true. i think DVD media is 1mm+
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error5
Senior Member
_ 		21. January 2007 @ 09:50 _ Link to this message    Send private message to this user   
eatsushi is correct. Both data layers are 0.6 mm below the surface:

http://en.wikipedia.org/wiki/HD_DVD

Quote:
Like the original DVD format, the data layer of an HD DVD disc is 0.6 mm below the surface.
JoeRyan has a point though.
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