e130 Memory Card Problems

I have a Sandisk 512mb memory card in the expansion slot. I can load audio with the computer using the usb cable and it shows properly. If I use my Wolverine portable data storage unit to load the memory card it will show the song if I load one at a time but if I load an entire folder it will not show up on the e130. I have the memory card formatted to Fat. Does anyone have any idea why this is happening? I can transfer folder just fine with Windows XP or Vista directly to the card.

Have you tried moving files from the Wolverine to the PC and then to the card on the e130?