How does a dual layer laser record layers?

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Default User

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Jan 2, 2014
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I've been reading online about how a dual layer laser is able to record on two separate layers; but I can't figure out how it can burn the second layer without burning the 1st layer directly below it.

I know that the laser changes focus to get to the 2nd layer but once L0 is burned and the the laser changes focus to get to L1; the laser is technically burning both layers right? I know it couldn't be burning over L0 or else my data would be overwritten but I can't understand how the laser achieves this conceptually.

I'd appreciate any information that you may have about dual layer technology :)
 
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Default User

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Jan 2, 2014
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10,510
So you're saying that L0 is "finalized" before L1 recording begins so that even though the laser is focused on both layers while trying to burn the 2nd layer; L0 can't be written on since its been finalized?
 
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Default User

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Jan 2, 2014
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Just out of curiosity when a laser is "burning;" is it at a higher intensity or power than when it is reading? But the intensity of the laser can't be the only thing that determines the ability to write on a disc or else everything would be re-writable. Then what really makes a disc permanent?
 
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