Music library not picking up DISCNUMBER tag

Hello

I have a multi-disc album in one folder but separate folders for each disc, ie, CD1 & CD2. I've set 'discnumber' tag to '1/2' for CD1 and '2/2' for CD2, however all tracks are lumped together in music library as such....

1. Song 1 from CD1
1. Song 1 from CD2
2. Song 2 from CD1
2. Song 2 from CD2

Where am I going wrong please? I believe my disc numbering is correct as foobar2000 correct separates the two discs in library mode.

I don't believe the way I name my file and number track tag should come in to play here as the discnumber tag should identify the different discs, but just in case here is an example...

01 - Will You Remember Mine.mp3 (This is track 1, CD1)
(Track tag set to "01")

01 - So Much to Do.mp3 (This is track 1, CD2)
(Track tag set to "01")

Thank you