[MacDV] DVD Size

[Erica Sadun]

At 8:50 AM -1000 12/25/02, Larry Richelli wrote:
>Hi
>I just use the get info on my SpiderMan DVD and it said that it was over 7
>gigs. How do they get that much data on a dvd when we can only get 4 gigs or
>so on one?
>Thanks and Happy New Year!

DVDs come in different sizes. Single layer, double layer, etc.
Do a google search on DVD-5 DVD-9 and you'll find more about
some of the standards.

Here's a list from http://www.discusa.com/dvd/dvdspecs/dvdformats.htm

Name	Capacity (GB)	Layers	Sides	Comments
DVD-5	4.7	1	1	Read from one side only
DVD-9	8.54	2	1	Read from one side only
DVD-10	9.4	1	2	Read from both sides
DVD-18*	17.08	2	2	4 layers, read from both sides
DVD-R	4.7/9.4	1	1 or 2	Recordable DVD
DVD-RAM	2.6/5.2	1	1 or 2	Rewritable DVD
DVD-RW	4.7	1	1 or 2	Re-Recordable DVD

-- Erica