That's very interesting, Dan. HDCD should play in any player - it just won't be decoded as HDCD if the player doesn't support it. I only have a few of them, but they play on the computer's dvd and cd-r/rw drives, the car cd player, and my Onkyo DVD player. The only case where they are actually read as HDCD is on the computer when using Windows Media Player, because it recognizes the disc as HDCD.