From the help file...
View Removable Media by Category
The easy way:
Add a new View Scheme (right click on Media Library) and call it 'Removable media types'.
In the View Scheme properties dialog add "Type", then add "Volume Name".
In Search Criteria, type: ~d=c (to search your CD database only).
Your removable media will be sorted as cda, dvd, mp3, ape, etc.
Feel free to rename the volume names.
The other way (this way gives you more control over what you see):
Add a Playlist Group named 'media type'.
In that Playlist Group create three (or more) Smartlists:
Call the first one 'CDA' and set the rule 'location=.cda'
Call the second 'DVD' and set the rule 'location=.dvd'
Call the third one 'DATA' and set the rule '-location=.cda
-location=.dvd'
Now edit the 'CD & DVD' View Scheme. Add the Playlist Group 'media type' then use the up/down button so that the order is Playlist (media type), Volume Name.
Now when you select the CD & DVD view, your removable medias will be sorted in on of the group CDA, DVD, DATA depending on the media. You can Rename each Volume name so that it's significant.
– CMagic
Does this help?