These CD-R's support the Serial Copy Management System.
These discs have an unbranded, no-logo, matte-silver surface. In the center hub, it reads, "MAM-A AUDIO 80MIN", which is the manufacturer's way to indicate that these are Digital-Audio CD-R's.
Some Philips models (specifically the 775 model, and occasionally the 765, 785 and other similar models) may not work with these cd-r's due to the Philips' common problem of a faulty power calibration unit.
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