the problem is not with the mac os, just with slot loading drives. tray loading macs can use these mini-cds (i've used one from the navy in my ancient 6116 with 7.5.1) the problem is one that we mac users have faced for ages, the software is windows only. if you have a tray loading drive, you can stick a mini-cd in there and access the files, but if it's a promo disk with some kind of software or demo, you'll probably only be able to view their little demo on a windows box. i'm not sure about audio mini-cds, but they're probably the same as any other cd and should play just fine in a tray-loading mac.