Why do I need a USB Storage Device to use a Premium Voice?
Your USB Storage Device will be used to transfer files between your computer and your instrument. You will not be able to install your Premium Voice without a compatible USB device:
Yamaha recommends a device with at least 300MB free.
What is a USB Storage Device?
A USB Storage Device (e.g. Thumb Drive, Flash Drive, Jump Drive, USB Hard Drive) is a file storage device with a USB plug on one end that can connect to any USB-ready computer or keyboard.