I get a lot of off brand media. Sometime this is just to test but when shopping for blank media it is advised no matter of the brand to look on the labeling package and ensure it is made in Japan or Taiwan.

I don't even tell people to just go out and buy better media like Verbs or TY's as that alone now can't be enough since verbs are being more commonly produced in Indonesia. So the best advise is look at the labeling.