What is DSD and isn't it the same as SACD??? HDCD does not light up on Rotel 1098?

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Hi Everyone,
I found CDs that say Telerac DSD format or simply a DSD CD. What is DSD besides Direct streaming?? I though that DSD meant that it is a SACD CD format?? Am I wrong?? So what is the difference between DSD and SACD??
Also My Rotel Processor 1098 does not Indicate with a light or any indication that I am palying HDCD on my Rotel TCD-1072. Why?? The RCD 1072 has a red light that turns on when you play an HDCD CD but the processor 1098 does not indicate anyhting ( Light or anything). Am I receiving a true HDCD signal from my 1098 processor in HDCD or not?? I can't tell!!!!!!!!!!!! If there is no indication on my processor, except from my CD player 1072 that I am playing HDCD, then how would I know if my processor is really actually playing my 1072 in HDCD??Hope that explains things.
Thanks in advance for all your help,
Chinets

[zeropoint]

Well, I'm not sure, but, assuming you mean Telarc DSD, I think this means they mastered the recording in DSD (Direct Stream Digital) which is the bit-stream format directly encoded on SACDs. However, in this case, apparently, all Telarc's original DSD recordings are directly down-converted to produce the CD master, using a special process called "SBM Direct". So, DSD is the format used directly on SACD, but the DSD master can be down-converted to PCM format for regular CDs.

Thanks Zeropoint for your kind help!!!!!!!!!

[neilwilkes]

Considering the DSD stream will have been doubtless created from a PCM one in the first place, it seems to be an utter waste of time going from PCM>DSD>PCM.
Why bother?
Especially considering the monstrous noise shaping required to make DSD listenable.
All there is above 23KHz in SACD is noise, and lots & lots of it.