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Dual Layer DVD writing...

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spaced | 15:38 Tue 29th Aug 2006 | Technology
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My new laptop can record onto dvd, just like my pc, but it says on the disc tray "DVD - RW / DL"

I assume this is dual layer. What is dual layer recording? Whats the difference from normal recording?

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If you get a dual layer disc you can put twice as much info onto it as a single disc
4 types of DVD:

DVD5
DVD9
DVD10
DVD18

DVD5 is like a regular CD in that it's one-sided (one side is the data, the other is the label), and also single-layer (just one layer of data).

DVD10 is twice a DVD5 (hence the name). So it's like taking two regular DVDs and putting them together so the label sides touch: double-sided, but still single layer.

DVD9 is dual layer, which is like the DVD5 but it has two layers of data, not just one. Still single-sided though, with the other side being the label side.

DVD18 is, you've guessed it, dual layer and double-sided.
Back when dual layer was quite expensive to produce, they made DVD14 discs, which were like one DVD5 and one DVD9 stuck together (double-sided; one side was single layer, the other was dual layer).

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