Sansa express memory expansion not seen on car head unit

i have been useing my sansa with my car head unit via its usb port for while now and just added a sd card to the expansion slot. and filled that with extra songs but the head unit wont see the songs that or on the sd card.

i have formatted the sd card useing the settings menu on the player and windows sees the sd card fine so the card works. so am i mising some thing or is it my car head unit :frowning: been stupid?

Most simple USB reading devices only see the first drive on any device, and the Express exposes the expansion card as a second drive. 

I’m not surprised that your head unit only sees the internal memory. 

If you want it to see the expansion card, I’m guessing that you need to put the card in a card reader by itself.