Hi guys,
Just so you know, SD cards larger than 32gb do work in CDJ2K's. Tried it myself yesterday, was not dissapointed. Make sure it's FAT32 (MS-DOS in Mac OS) formatted and it should work no problem.
Here's the proof, this is the card:
http://i.imgur.com/y7xRvtH.jpg
Here it is in an old 2K:
http://i.imgur.com/lVZcqlw.jpg
Hope it helps some :)