While preparing Specifications for DVD Recorder sets, I noticed that they are in a range from 0.8 mW to 1.2 mW for Laser output power during reading, and from 20 mW to 78 mW for Output Power During writing. And also the Laser Wavelength is different form one another 650, 658,
780, 785 etc. I thought they should follow the standard value which might be the same for all the DVD Recording units selling in the market. Any comments?
All I know is that I think I saw a youtube video of someone igniting a match with a DVD laser... D from BC
D from BC wrote in news: snipped-for-privacy@4ax.com:
Why would DVD's take so much power to write? Do CD's need that much power?
also,shorter wavelength means more data can be written.
-- Jim Yanik jyanik at kua.net
(nano meter range)
I'd expect the power to be proportional to the datarate and we're not slow anymore, the movies would never get written.
Rene
Does anybody know the standard figures for them? I mean, is there any standard for this? Regards
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