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Old Aug 19, 2002, 01:13 PM
aa3k aa3k is offline
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Join Date: Apr 2001
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Writting to dvd9 is possible at present as far as i am aware (i may be wrong), u just have to flip the disk over to write to the other side.

Don't know much about writting to both layer at the same time.

Hope it would be possible in future. Fingers crossed.
Old Aug 19, 2002, 03:30 PM
rishardc rishardc is offline
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Location: hawthorne, nj, usa
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Maybe I missed it in that long quote, but where did it say DVD-9 is possible???
Old Aug 19, 2002, 05:47 PM
wilt wilt is offline
Join Date: Jul 2000
Posts: 587

And flipper disc's arn't DVD9's...there just double sided DVD5's.

Using 2 lasers it will be possible to burn the second layer without altering the state of the first.
Using 2 different dye's and focusing each laser on a specific dye.
It's not gonna happen over night.....but "build it and they will come........"
Old Aug 20, 2002, 05:39 PM
gadgerman gadgerman is offline
Join Date: Apr 2002
Location: Bolton
Posts: 164

Perhaps I was misunderstood and I, worded it badly (early hours and I was tired ) apologies . What I was trying to say was that DVD9 is dual layer technology and how does the burning laser get through the inital layer to burn the deeper layer without damaging the initial layer . they are produced at the moment by pressing (welding ? bad turn of phrase on my part) the 2 layers simultaneously and this can't be duplicated at present using burning technology
Old Aug 20, 2002, 06:34 PM
Kaizerboy Kaizerboy is offline
Join Date: Jan 2002
Posts: 917

For the record :

DVD5 = Single sided, single layer
DVD9 = Single sided, dual layer
DVD10 = Double sided, single layer
DVD18 = Double sided, dual layer

As stated before, DVD9 discs are 2 thinner discs pressed together. the data on the 2nd layer has already been pre-written before it has been pressed.

To be able to write to a dvd9 the writer would need a new kind of laser that could burn the 2nd layer without affecting the 1st layer, at this minute in time it's not possible but even if it was the cost of the writer would probably be triple that of a standard writer.
Old Aug 21, 2002, 12:55 AM
Don2050 Don2050 is offline
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Join Date: Aug 2002
Posts: 10

Since we're speculating here.....

Burning through a first layer onto a second withought damaging the first and then being able to burn the first layer after could possibly be accomplished by being able to adjust the wavelength of the laser and perhaps modifying the media or dye to pass through the laser at a certain wavelength but reflect it at another. In essence, a variable wavelength laser with media/dye that reacts specifically at those wavelengths.

As to how easy that would be to build....? I am not up to date on the current state of solid state laser technology......buuut, if there happens to be a physicist among our forum perhaps they could shed some light

ok, I will stop

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