...Every time I try to erase music from my USB Key or Phone. You can see that the music or files have been erased, but it doesnt free up and space. When you pop the USB Key into the stereo or play music on the phone, all the files are there. I have to go through the Disk Utility option to erase stuff, but this erases everything. When you erase on the PC, everything is fine. Can anyone help with this? Is there anything I'm missing?