My ipod nano. when connected to a computer doesn't appear as an ipod but a USB device instead. Please help.

Please help me! I badly want to transfer my videos to my computer but it won't appear as an ipod nano but a usb device instead. So I can't see the DMIC folder. I only see 'Recordings', 'Recylcler', and other folders but I can't see the DMIC folder. And yes, I already enabled it to disk use, but it still won't appear. Please help.