microSD cards seem almost excessively tiny. They can fit comfortably on a dime. And yet that tiny package can store dozens or hundreds of gigabytes of data. They seem to be a tiny mystery. But they are actually just the same as their larger sibling, the SD card. They’ve just been squeezed into a smaller shape.
microSD cards aren’t much different from any other data storage device. This microSD card had a partition table, a boot sector, and a filesystem, just like any hard drive. This particular GoPro memory card had the exFAT filesystem. The exFAT filesystem is an “upgrade” to the FAT32 filesystem. It can be read by both Windows and Mac machines. exFAT isn’t quite as compatible or widespread as FAT32. After all, its predecessor has the benefit of having been around since 1996. But it has many advantages over FAT32.