[mythtv-users] [OT] How may bytes available on a single layer DVD-R?

Stephen Boddy stephen.boddy at btinternet.com
Sun Mar 13 18:40:17 UTC 2005


On Sunday 13 March 2005 17:59, Ron Johnson wrote:
> On Sun, 2005-03-13 at 12:02 -0500, Cory Papenfuss wrote:
> > > How may bytes or MB is the capacity of a DVD-R disc? I am currently
> > > using a guessitimate of 4250MB as the limit for my shrinking routine
> > > but it would be nice to have the actaul value for fine tuning.
> >
> >  	It's commonly referred to as 4.7 GB.  Of course, that's 4.7 GB in
> > marketspeak, which means its 4,700,000,000 bytes.  In *real* GB, divide
> > by 2^30 = (1024*1024*1024) = 1073741824.  For MB, divide by 2^20.
> >
> > Thus, it's
> > 4.7e9/2^30 = 4.377 GB, or
> > 4.7e9/2^20 = 4482 MB
>
> Not marketspeak anymore.  Drive makers have been doing it long
> enough that it's not "weird" anymore, like it used to be.
>
> http://physics.nist.gov/cuu/Units/binary.html

When computers work in base 10, then it stops being weird >:-(
-- 
Steve Boddy


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