I consider bad media. Since TEAC has excellent writing Quality. If it was a different brand (Lite On / Acer) I would have said incompatibility but not for TEAC.
About errors burned on cd's I can state that the only disc's that I have burned with my plextor Plexwriter 24/10/40A and that did contain errors were low quality media. Any decent brand never gave me an error if the writting went correct. (Still it is true that allmost one complete box of TDK(TY) failed when being written)
With my Philips 3610 I have one philips(TY) disc with a yellow spot(damaged) and much CMC cd-r's. However this TY disc isn't fair to count since it was burned when the drive was allmost dead and wouldn't burn most disc's any more except for Mitsui disc's.
Manufacturers that gave errors after writing were:
CMC,Acer (but only after burning more than 78:30 minutes of audio or data), Plasmon, Lead Data, MBIL
My policy is zero errors even after 5 weeks outside.