Well, since we seem to be pulling out all (ok, only some) of the stops, I'll shed some more light on my own comment
Maxell 16x DVD+Rs -> PHILIPSC16 (made in Taiwan, by CMC)
Fuji 16x DVD+Rs -> PHILIPSC16 (Made in Taiwan by CMC)
Philips 16x DVD+Rs -> PHILIPSC16 (Made in Taiwan by CMC)
Imation 16x DVD+Rs -> PHILIPSC16 (Made in Taiwan by CMC)
Verbatim 16x DVD+Rs -> MCC004 (Made in Taiwan by CMC, and Made in Singapore by Mitsubishi Chemicals)
Memorex 16x DVD+Rs -> CMCMAG.M01 (Made in Taiwan by CMC)
Ritek 16x DVD+Rs -> RITEKR04 (Made in Taiwan by Ritek)
Taiyo Yuden 16x DVD+Rs -> YUDEN000T03 (Made in Japan by Taiyo Yuden)
Optodisc 16x DVD+Rs -> OPTODISCR16 (Made in Taiwan by Optodisc)
Daxon 16x DVD-Rs -> DAXON008S (made in Malaysia by Daxon)
Optodisc 16x DVD-Rs -> OPTODISCR016 (Made in Taiwan by Optodisc)
I'm happy to say that I either have currently, or am expecting samples of all the above media (with the exception of YUDEN000T03... that one still illudes me for the moment).
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