I saw one post in which someone claimed that he got a full size 64GB SDXC card to work with a Sandisk player using an adapter when the card was formatted as FAT32. Of course this was sloppy, with the card hanging outside the player connected by a cord. The full sized SDXC card is the same as the micro card except for size. First of all, Sandisk warns against using FAT32 for SDXC and micro SDXC cards(i am not sure why). Sandisk is selling 64GB micro SDXC cards now, however they are $220 each. since 32GB micro SDHC cards are now only around $40-45, most people will think paying $220 for a 64GB is ridiculous.
The Sandisk Fuze, Clip+ and Zip have a song limit listed as 8,000 songs, although those with embedded album art, or long tags or finenames and folder names might hit the limit much sooner. So unless you are using 320 kbps or lossless or have very long songs, as a practical matter you will probably not be able to make full use of a 64GB card. If you have so much music, then you should buy an extra Clip+ or Clip Zip, and put a 32GB card in it.
Carrying two Clip players is easy. It will also give you more battery life than just carrying one player. A Clip+ or Clip Zip and two 32GB micro SDHC cards is much cheaper than a 64GB micro SDXC card. Perhaps in a year or two the 64GB micro SDXC cards will be under $100. Then there probably will be players that officially support these.
