Quality View

[leighton buzzard]

I've set up a View by Quality option in Minimserver which I really like. It basically displays LC (Lossy Albums). CD (CD Quality Albums) and then CD+ and HD for albums that are higher than CD quality. My question is this. What is the difference between CD+ and HD and what determines which catagory the album is displayed under? The reason I ask is because I have the new Led Zeppelin 24Bit remasters. Led Zep 1, 2 and 4 come under HD and Led Zep 3 displays under CD+. Why is this? They're all 24Bit/96k files so what's causing 1 album not to display under the HD catagory?

Is there a way to combine the CD+ and HD folders or is there actually some quality difference between the 2?