These discs include a Diamond Coat Protection surface, which resists scratching and fingerprints on the top of the disc. Just below the lacquer surface & reflective layer on top of your disc is the dye layer, which is what stores your data. Normal CD-R's leave this most vital area of the disc as vulnerable to scratches and fingerprints. Diamond Coat Protection surface is an extra hard surface that protects the dye layer and keeps your data safe. 80-Min (700MB) CD-R's: Mitsui (MAM-A) brand! ARCHIVAL-GRADE DIGITAL-AUDIO CD-R Media. Product Code: MITSUI11066. 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. These are the media needed for recording on Philips, Pioneer, Harman/Kardon, JVC & Marantz (and others) brands of home CD-Recorders. Known as Digital-Audio, these are the media supported by consumer audio-only cd-to-cd home recorders. These consumer audio-only CD-R discs meet the standards of the Audio Home Recording Act (AHRA) of 1992, which requires a royalty to be paid by the disc manufacturer to the music industry. These CD-R's support the Serial Copy Management System. Important Compatibility Note: 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.