Pop it in your machine, open Explorer (Windows button + E), right click on the drive and select Properties from the menu.
File system tells you the format. FAT is 16 by default (BUT someone could have changed the allocation unit size when it was formatted), FAT32 is ermm 32 by default.
Nothing appears to tell you the allocation unit size.
Only sure way is to backup the content of the drive then reformat it, selecting File system FAT and allocation unit size 16kb.
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