What is the capacity of a BD-R disk really?

Andre Robatino robatino at fedoraproject.org
Sat Nov 26 16:09:25 UTC 2011

Tom Horsley <horsley1953 <at> gmail.com> writes:

> On Sat, 26 Nov 2011 15:15:29 +0000 (UTC)
> Andre Robatino wrote:
> > so
> > if the container says "25 GB", that means 25*1000^3 bytes
> Yea, that much I knew, but the best info I've found so
> far is here:
> http://www.hughsnews.ca/faqs/authoritative-blu-ray-disc-bd-faq/9-disc-capacity#9.2
> and even it gets really fuzzy. Some variable amount of
> overhead required for "defect management", and also
> overhead for the UDF filesystem itself.

Using command-line tools, can you actually create an ISO of size <= 25 GB which
can't be burned to your media? I would hope that the advertised capacity doesn't
include unusable overhead, otherwise the number is meaningless.

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