- Optical Quantum Music Digital Audio Silver Top 700MB 52x Blue AZO CD-R with Noise Free Playback for Optimal Audio Music Recording, 100 Discs

Either these Music Digital Audio or the the other music and data AZO discs highly recommended. I record all my CD-R at 4x and get almost an exact duplicate of the source with no errors, strong bass, excellent soundstage and smooth presentation. Yes, slow CD-R recording results in the best sound for archiving. It amazes me that so many buyers write nonsense in their reviews. I am so tired reading that buys can't tell the difference between the top and the recordable side. That is impossible. The top side is silver and if one hold it under a strong light, the concentric etchings will be very obvious. The recordable side is green not blue even though AZO dye is blue, it gets changed from green due to the reflective layer but is totally obvious which is the recordable side. And these discs are as good as any today for precise recording and longevity since gold discs are too expensive. I have 100s of these discs and not one has ever gone bad. I have only ever had one recordable go bad and I have been recording since 1989 and that was a DVD-R DL. The AZO Verbatim and Optical Quantum are as good as you will find today for now and the future.

These are completed garbage both sides are clear with no label so you have to really look close to see which side is which also half of them do not read

both sides are completely blank and look the same. couldn't figure out which was the recording side.