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I did the Microsd card in exfat. Mac seems to read it and windows. Is this a correct format?
exFAT is a great format as it runs on Windows and Mac (maybe even Linux) yet doesn't have the incredibly annoying 4GB file size limit that is present on FAT32. On the other hand, it's quite new, so old hardware (Windows Vista/Mac OS 10.5 and earlier) doesn't run it. So yeah, you can use that.
 
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