Interesting, and it makes a bit of sense, even if it is counterintuitive. "It creates a single file system that spans the internal storage and the SD card." -

Interesting, and it makes a bit of sense, even if it is counterintuitive. "It creates a single file system that spans the internal storage and the SD card." - Meaning that you don't worry about "shall I store this photo in the phone or in the card" and juggle disk space around after upgrading the memory.