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Message: <blockquote data-quote="LateAdopter" data-source="post: 1048862" data-attributes="member: 412234">USB sticks and SD cards of 64GB, or more, come formatted exFAT which won't work.You need to reformat it to FAT32 with 64kB (128 sector) cluster size. The default cluster size for FAT32 is too small for recording video, so you have to specify the cluster size when doing the formatting.Do not delete or move the partition, or you may lose the alignment, just reformat it.I have a 64GB SD card, formatted that way, that works fine with my Primo as does a 1TB disk with two FAT32 partitions.EDIT It's likely that 128GB will use 64kB clusters by default anyway, so you may not need to specify it. It's more of a problem with smaller capacities.</blockquote>