quoted 13 lines +------>+------
>grievous iv - gymkata! wrote:
>>
>> but does it compress the information? will people _buy_ it? personally,
>> i hope not, i'm sick of the format-change-of-the-year games.
>+-----
>
>I read somewhere, in a technical article, that DVDs main asset in it's
>storage capacity was not data compression but a laser that had a much
>more focussed beam and that the laser light was at a different wavelength
>than the regular laser companies now use for scanning CDs.
>
>
I believe the spec also allows for a bi-layer format.
The laser can refocus through the upper (relatively translucent) layer and
read the layer below. Hence a further doubling of data density.
3