This is a good basic study.... but it fails to give enough data about the individual samples. Through understanding of the products, and a little begging, I am fairly confident about the following:
S1 + S3 are Verbatim/Mitsubishi, or Verbatim/Mitsubishi OEMs. Only Kodak and Verbatim/Mitsubishi really ever used Azo, so it really limits the options.
S4 is a Kodak Ultima Gold CD-R. (This one I learned from begging). Unfortunately, the chances of finding any of this media now a days is next to impossible as Kodak hasn't *MADE* media for a very long time (and current Kodak media is outsourced crap).
S5 is Taiyo Yuden. This is an educated guess on my part, but I'm fairly confident in it.
Either S6 or S7 or both were manufactured by Mitsui (pre-MAM-A and MAM-E and CSI!!!).
Unfortunately, most of the media used in this study is no longer available. And the media that *IS* available is well known for having gone down hill (in the case of Mitsui/MAM-A/E quite dramatically) in quality. In other words, it's a great study, but we need it to be re-done with modern media samples, and with a little more descriptive information.
This one I'm less impressed with. The media is even older and less available, and the results are displayed in such a way that it makes the whole thing useless. I don't think there is one piece of information worth taking away from this PDF unfortunately.
loopy wrote:the last seems to show pthalocyanine dye CD-R's as being the best (but of course with much less capacity than DVD) with double-sided single layer DVD's being the best in their class. Taiyo Yudens were not identified (as to dye type).
The thing you need to remember is that the dye itself is only 1 small part of the manufacturing process. In a lot of cases, it's a lot MORE important to have good quality control. For instance, Ritek's Cyanine based CD-Rs were utter crap! but Taiyo Yuden's Cyanine based CD-Rs are quite excellent. Mitsui's Phthalocyanine CD-Rs were quite good (before they were bought out by CSI and everything fell apart), but DST's Phthalocyanine CD-Rs were horrible.
So Dye alone won't tell you anything really.
Punch Cards -> Paper Tape -> Tape Drive -> 8" Floppy Diskette -> 5 1/4" Floppy Diskette -> 3 1/2" "Flippy" Diskette -> CD-R -> DVD±R -> BD-R
The Progression of Computer Media