I want to install new music that I have on a USB thumb drive in our new 2014 CX-5 Touring 2.5L vehicle. It has the type B audio system. I want to revise the music, but I have not been able to replace the first music files that I first loaded thru the USB port. I thought the music was deleted from the sytem when I removed the thumb drive and turned off the engine, but that is not the case.

I removed the two audio fuses (#38 & 44) in the engine compartment fuse compartment and then reinstalled them, but the files are still there! So far no help from my dealer or Mazda Customer Service in Calif. There must be a way to delete those old files!