Why old phone sees on the formatted map a non-existent folder?
It took in an old nokia c2 insert memory card. Card formatted, at first quick, then full among nokia sees her a bunch of different folders (android, assets, and other backups created by aneroid), and a few tunes.
Android automatically without your knowledge and creates new memory card, the following folder is empty.
for the melody don't know maybe that makes some app on the phone (in fact these folders create each your application).
p.s. a full format is no different from the quick, this is just a test to read sectors (which by the way you can ignore the memory card and always return true).