Linear PCM 5.1 v Dolby Digital 5.1

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Grumpy

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Hi

I saw the above audio formats on a blu-ray dvd.  Can someone please explain in plain English:

a.  I thought PCM is stereo, so what is Linear PCM 5.1 then?
b.  I have also seen "uncompressed" PCM 5.1 or was it 2.1 - And this means?
c.  Somewhere on the forum I read that some folks prefer PCM (above formats) to Dolby Digital 5.1.  This being digital, how can PCM be better than Dolby Digital?

Confusion reigns...
 

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