What do DCF and DCIM have to do with your digital camera’s files? Our friend, the How-To Geek, can tell us …
DCF is a specification created by JEITA, the Japan Electronics and Information Technology Industries Association. It’s technically standard CP-3461, and you can dig up the arcane standards document and read it online. The first version of this standard was issued in 2003, and it was last updated in 2010.