CD-R
There are two types of blank CD-R, "music" and "data". The only difference is that "music" discs have a bit set on the disc that indicates a royalty was paid to the music industry. Consumer-grade music recorders look for this bit and won't record to discs without it. This is done to meet the requirements of the Audio Home Recording Act and similar laws. Professional equipment (including rackmount audio CD recorders and all computer drives) is not affected and will record to either type of disc. The bit has no effect on playback once the disc has been recorded.