SD Card Formats

On the Dragonboard there is an micro sd card slot. I would like to use it to save files. I formatted a micro sd card as FAT32 and saving to the card works fine. I would like to know if there is a particular format that is better to use for the micro sd card rather than FAT32. What are the supported formats?

There is nothing worse than fat.
Try ext4.

The only advantage of FAT32 is its wide support/compatibility [1], so if you plan to use your SDCARD on multiple operating systems, this is probably fine. But this is an old file-system (1977) with limitations, 4GB max per file, no journal (prone to corruption), no file permissions…

So I agree with doitright, you should go with ext4 (Linux permission compatibility, better perf & reliatbility…).