From:	Paul Gettle <pgettle@********.NET>
Subject:	Re: What's a megapulse?
Date:	Wed, 27 May 1998 11:36:40 -0400

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At 11:19 AM 5/27/98 +0100, Gurth wrote:
>You can also do it like this: we know a CD-ROM holds 640 MB. SR CDs
hold
>500 Mp (says Shadowbeat), so 1 Mp = 1.28 MB. This would assume no
>breakthroughs in storage capacity, which is unlikely seeing DVDs hold
a
>lot more; I don't have the storage capacity of a DVD handy, though,
so I
>can't calculate how much an Mp would be when based on that. A lot
less,
>that's for certain.

The highest capacity version of DVD: double sided, double layered,
factory printed/read only, stores 15.90 gigabytes. IIRC the 500Mp CDs
in SR are recordable, but I'm sure that by 205x, the 'factory
printed/read only' bit will have changed. I imagine though, there will
have been more advancements that would have pushed the capacity up
even more, so that we can't make a Mp-->byte conversion table.

Right now, double layered DVDs have a layer that's transparent to one
wavelength of laserlight, and reflective to another, to allow about
twice as much data per side. Anyone care to speculate how many more
layers they'll be able to add?


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-- Paul Gettle (pgettle@********.net)
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