I wanted to add a partition to my 16GB USB flash drive today and I ran into a problem. Disk utility shows my just formatted drive as half full: The "Data" volume is completely empty in Finder. I tried deleting the volume and readding it but Disk utility still shows half of the drive in blue shade. Earasing free space also didn't work. When I try to add a new partition, it doesn't allow the original volume to shrink less than the presumed used space: Ideas?