I thought unetbootin was targeted towards single partition drives? The main advantage of what I've written is you get a nice FAT32 partition with syslinux, and secondary partitions on your USB drive for the actual OS; thus Windows (dunno about Mac) can use the drive normally, and it doubles as a bootable drive. Unforutnately unetbootin's "how it works" page is extremely sparse on detail. http://sourceforge.net/apps/trac/unetbootin/wiki/howitworks