Fuze and micro sd

My Phone have a micro SD slot and it was the first use i make for the micro SD card.

I put some song on the card, there were readable by the phone but invisible on the Fuze (without formatting between phone and fuze)

Then i formatted the card in FAT32 with the Linux Formatting Software (Gparted), and put a song which were in the internal memory of the fuze (i.e the ID3 Tag was readable), but nothing happens : when i move the song from the internal memory to the external card, the song disappears from the list of song available on my fuze.

At work, i’m on windows, so i formatted in FAT32 with the Windows Formatting Software (right-click>Format…) and do the same operation (Put a song from the internal memory on the card), but there were no more results.