Webfeger:
. . .
but now the interesting part: I delete two mp3 files and windows display only 4 mp3 files but dfplayer detect 6 mp3 files and play all of them. so i think dfplayer looking for file sectors and didn't use the MFT or Index of FAT.
. . .
It does look like the file system handling on the DFplayer is very primitive. If you format the SDcard in Windows (quick format) does the DFplayer still find old deleted files ?