Hi Donny,

I think you got mixed up on the following 2 things:
1. User - only 13 MB for your PSR-S970 (internal memory)
2. Expansion - 512 MB non-volatile RAM dedicated for expansion packs

Most Yamaha arranger users now store their keyboard setup related voices, styles, registrations, multipad files, music finders / playlists on the USB flash drive and use them directly from the USB drive. Genos has a 58-GB of SSD as User, so some Genos users prefer storing their stuff on the User area of Genos, and use the USB drive for backups and file transfers, while some users prefer using USB drive only for everything.

Since there are specific drive paths referring to User and USB, you may want to batch covert your registrations using Murray Best's YRM 5.11 to point to the USB drive:

Murray Best Yamaha Registration Manager 5.11

Usually, the drive path name for User is C:, and for USB is I:.

Thanks,
Paul