A lot of CDs are not labeled. A complete list of all HDCD discs labeled or not is at:
My DAC display's "HDCD" when it recognizes an HDCD disc, and I've occasionally been surprised to see that an unlabled CD has actually been HDCD encoded-- don't remember which at the moment, but Lucinda Williams "Car Wheels on a Gravel Road" is an HDCD disc, and I don't know that it's labled as such. An excellent recording BTW. Cheers. Craig.
Here's another slant on that question,2 Against Nature by Steely Dan is noted as a HDCD disc on the official site yet I have only seen it in the UK as a normal disc-anybody got an HDCD version?
I'm with Sugarbie on this,off top of my head-The Doors Complete Studio Box-set,XTC's Wasp Star and Dave Brubeck Take 5 are releases that have no HDCD's makings anywhere but are on the list.
Craig my copy of CWOAGR has a large HDCD logo on the CD booklet.
I've noticed that a lot of non HDCD's easily whomp quite a few HDCD's. Some HDCD's are amazingly well recorded though. I have a couple of great ones that are not labeled (HDCD) and are not on the list:
The Other Quartet-Sound Stains (KFW297)(a bit like some of the best instrumental Zappa)
Vincent Courtois-Translucide (ENJ93802)(tuba, guitar, trombone, electronics and the meanest recorded cello I've heard.
Although I have never considered the Grateful Dead as Audiophile listening material I must say If you feel the same you will change your tune if you happen to hear The Golden Road(Box Set remastered RHINO WARNER BROS) HDCD.
I remember listening to my brother play this stuff growing up if it sounded this good I would have drank the Koolaid too. Now if you are a "Dead Head" and own an HDCD player you need to buy this.