Roland keyboards require a database structure when working with files on Zip drives. I forget exactly what Roland calls this annoying system. In order to preserve the files on both your PC and the keyboard Zip drive, you must use a special utility program called RDBM (Roland Data Base Manager). It used to be available for free from Roland and on the web.I don't remember if the VA-7 and VA-76 still rely on that system, but I think they do. Maybe some other Roland users will respond. This could be what is causing you trouble.

Tom G.