[B]RITEK[/B] was never really top-notch.
Even before RITEK G05, the antecedents G03 and G02 suffered from quality problems, and some G04 also did. :a
The [B]Taiyo Yuden[/B] issues are much much more complicated. Let me summarize it in a few sentences. If you want me to elaborate, just ask me.
[B]8x DVD-R DL media:[/B]
DVD-R DL is a problematic format. They deliberately chose DVD-R DL over DVD+R DL because the Japanese market prefers DVD-R over DVD+R for historical and legal reasons (copy-protected TV, CPRM support).
[B]16x DVD media:[/B]
Although 16x TYG03 was already introduced in 2004 (and presented at CEATEC at Makuhari Messe, Chiba), many manufacturers waited with implementing proper burn strategies for TYG03 until late 2005 or even 2006, [I]two[/I] years after the product’s introduction! This situation has improved though, most recent 18x (and some late 16x) drives overspeed 16x Taiyo Yuden media to 18x and include proper burn strategies (LiteOn LH-18A1X, LG GSA-H10N and successors) so 16x Taiyo Yuden is not as bad as it is often considered to be.
It is a fact that some 16x TY batches are only average (TH000015, TH001330, TH001333 for example) while other batches are performing as well as good YUDEN000 T02 or TYG02 if burned in the right burners (TH000020, TH000021, GH000073), but this is another topic. In fact quite some of my Fuji T02 burned worse in my LG than the TH000021 T03 in the same LG.
Note that similar developments during the transition to 16x media were observed at other factories too. Not only TDK, but also companies like CMC have severe QC and support problems. CMC MAG M01 is unsupported by a huge number of burners.
The bonding problems have mainly existed with TYG02. The 8x DVD-R media from Taiyo Yuden is generally slightly worse on the mechanical side, the TYG02 are slightly more sensitive to scratches than YUDEN000 T02 are.
I haven’t noticed problems with YUDEN000 T03 and YUDEN000 T02, at least the TY DVDs I used were just as well bonded as MCC 004 were.
I hope this long, messy post (although I didn’t want to make it as long and messy as it is now) has helped to clear some things up
If it didn’t, just tell me what went wrong