These are the CD formats (media/mastering) in the audio industry:
1. Normal Audio CD (http://en.wikipedia.org/wiki/CD#Audio_CD)
2. SACD (http://en.wikipedia.org/wiki/CD#Super_Audio_CD)
3. Enhanced CD (http://en.wikipedia.org/wiki/CD#Enhanced_CD)
4. DVD-Audio (http://en.wikipedia.org/wiki/DVD-Audio)
5. XRCD, XRCD2, XRCD24 (http://en.wikipedia.org/wiki/XRCD)
6. K2HD (http://en.wikipedia.org/wiki/K2_High_Definition)
7. HDCD (http://en.wikipedia.org/wiki/HDCD)
8. A2HD1, A2HD2, A2HD3 (Mandarin site: http://rfs.21hifi.com/htm/CD18c.htm)
9. DSD (http://en.wikipedia.org/wiki/Direct_Stream_Digital)
10. LPCD1630, LPCD45 (Mandarin site: http://www.hugodisc.com/lpcd/)
11. Blu-spec CD (http://en.wikipedia.org/wiki/Blu-spec_CD)
12. BD-Audio (http://en.wikipedia.org/wiki/Blu_ray#Player_profiles)
13. SHM-CD (http://shm-cd.co-site.jp/about/about_e.html)
14. CrystalDisc (http://www.crystaldisc.jp/eng.html)