Hi

Sorry for short description. They are indeed test CD/DVDs.

On A-bex TDC784 I've found this: http://www.google.com/url?sa=t&rct=j...d=rja&ua ct=8
&ved=2ahUKEwj9zOHS173qAhWSyqQKHRHwA8sQFjADegQIBRAB &url=http%3A%2F%2Fwww.a-bex.jp%2FA-BEX_TEST_DISC_HP%2F2CD_%
2Fstandard_product_tcd_%2FTCD-784_.pdf&usg=AOvVaw2MRu4V0Id30PGjjuJIYleK

On DVD-MJK1 I can't find much info

A lot of manufactures refer to them in their service manuals. Often used for calibration of tracking.

KR
Kim



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