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stf92 11-06-2010 11:29 PM

ECMA-279: is this standard obsolete?

I have downloaded the following standard.

Standard ECMA-279
80 mm (1,23 Gbytes per side) and 120 mm (3,95 Gbytes per side) DVD-Recordable Disk (DVD-R)

(December 1998)
I do not know about the 80mm disk but I do know present day 120mm DVD-R disks are labeled "4.7 GB" by the manufacturer. Assume the 3.95 GB of the standard are really 3.95 GiB and that 4.7 GB are expressed in true GBytes (GB). Then, doing some arithmetics, we get 3.95 GiB = 4.24... GB, which falls short of 4.7 GB. Of course if DVD-R disks were labeled in GiB, then the difference would be greater.

This brings me to suspect the ECMA-279 standard is at present obsolete. Can this be so? Any hint would be greatly appreciated.

smoker 11-07-2010 02:46 AM

That standard is not in the withdrawn standards list available from the same site. Also, the sizes mentioned are nominal sizes, which can be taken to mean minimum capacity. See Brief History on page 5 of the pdf.

stf92 11-07-2010 04:40 AM


it's good to know. I've been lucky in getting an answer from you. It's a pity I'll never know if the standard was finally adopted as an international standard by ISO/IED JTC1.

It is expected that a corresponding International Standard will be proposed for adoption by ISO/IEC JTC1.
By the way, would you be so kind to tell me how could I know if this standard (ECMA-279) is a draft? Should the word 'draft' appear somewhere in the text if this were the case?

All the best and thank you very much.

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