The rarest/most obscure recordable medium



I have one box from 2014 MKM DVD+R DL.


Why was the error rate so constant?


So many germans here.
Were optical discs marketed well in Germany more than other countries? (Conrad Electric store offers DVD-RAM and floppy disks.).


Does it say 680MB?
Isn’t it 650MB?


Yet another marketing term?


I have a few SPEER Conputertechnics DVD-R×4’s at home. I will find out MID and send photo.

Has anyone heard about SPEER?


Como? Looks like kids edition


Didn’t know that QPXtool exists for Windows too.
This Sony has no SUPREMAS?

Manufacturer Sample Media IDs Origin Formats Notes
Pioneer PVC001001, PVC001002, PVCW00 Japan DVD-R, DVD-RW PVC stopped making media in 2003 (4x era)

Read more:

My Pioneer DVD-RW 1x came with my Pioneer DVR-A04 burner in 2002.


When Pioneer stopped making CDs and DVDs, the price of optical discs plummeted, meaning that it wasn’t economically feasible for them to continue production due to higher costs associated with production in Japan.


650 MB = 681,574,400 bytes.


So that means 681 MiB.



681.574.400 MB = 650.000.000 MiB

I have to pay attention, german and english language uses . and , different


Regarding the difference between binary MB and decimal MB, tell the hard drive manufacturers. Of course they’d want to make their drives sound like they have more space than they actually have!!


Manufacturers of Optical disc, flash memory do it also :wink:

At least since DVD, CD-R mostly write the real capacity


Even the “better” manufacturers of CD-Rs “mislabelled” their products, with the most famous (in my mind) being the early (1995/1996 vintage) Philips “Professional” CD-Rs labelled as “74min/700mb”, produced by Taiyo Yuden and Kodak.


Could be, I don´t have one of these exotic old media

Maybe some manufacturers also used the Mode 2 capacity?

When I start with it the capacity had the correct numbers


The only CD-R in a pack of 11 JCs?
Not really silver / green, the dye is phthalocyanine.
ATIP 97m27s19f (Plasmon)


The phthalocyanine dye used on CD-Rs is a very light green colour. This can clearly be seen if you peel the reflective layer off (don’t try this with a disc that you wish to keep!!!) and look through the disc with good light in the background.


That’s the case with this CD-R.

But there are also phthalocyanine CD-Rs (seen at Ritek, MBI, MPO, SONY, FTI) where the dye was made absolutely colorless. How does it work?