Electrical Engineering Question: DVD technology : capacity limit

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Date Posted: 7/10/2008 7:58:04 AM Status: Live

DVD technology : capacity limit

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I posted this question on the wrong forum so posting it in here again, thanks!

Hi

Can anyone advise me the limitations to increase the capacity of the DVD in terms of the principles and process involved in DVD technology?

I think the one is how each 'pit' can be closely pack together and since it's magnetic the alignment of the pit are important? e.g. only opposite pairs (+ / -) can sit closely together.

Also, here is what Howstuffworks.com says "To increase the storage capacity even more, a DVD can have up to four layers, two on each side. The laser that reads the disc can actually focus on the second layer through the first layer."

But, why not more layers? Is it simply just because we don't have technology to read 3 layers and more?

Thanks!

DVD technology : capacity limit

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