Yes. I have several HDCD CD's that are unmarked, but what you really want to do is check out www.hdcd.com. They list all of the CD's available in HDCD encoding. Good luck.
unmarked HDCD's
I have been digging through some cd's lately and have found a few that are NOT marked as HDCD encoded, but when I play them the HDCD indicator on my Toshiba SD-3109 dvd lights up. I thought liscensing required all HDCD discs to be marked. For example, 4 discs that I have found: Faith No More- Who Cares A Lot(the greatest hits}, God Lives Underwater- Life In The So Called Space Age, Live- Secret Samahdi, and Danzig- 6:66 Satan's Child. None of these cd's say anything about being HDCD on the jewel case or in the booklet. The Danzig cd is the one that really surprised the hell out of me. He's not known for auidiophile quality heavy metal by any stretch of the imagination. Has anyone else found some cd's that are not marked?