Do you have a book larger than 4GB? If not, FAT32 is fine. I do not believe current models ship with exfat support; you would need to compile the kernel module yourself and alter the mounting scripts.
There was a mod that could let you format it as ext2 or ext4, but you wouldn't be able to read it on MacOS or Windows easily (would work fine on Linux though; I did it for a time).
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