Info from Sony -
Notice for SDXC/microSDXC memory card and exFAT format used with Sony Reader.
Please be informed that Sony Reader does not support SDXC/microSDXC memory cards (*1), and exFAT format.
When exFAT formatted memory card (*2) is inserted in the memory card slot of an applicable model, your data in the memory card will be damaged. Please be sure not to use exFAT formatted memory cards.
(*1) SDXC/microSDXC memory cards are preset to exFAT format at the point of purchase.
(*2) Besides SDXC/microSDXC memory card, Sony Reader does not support other memory cards and other recording media that are formatted with exFAT.
