How do I identify the file system of a drive in Mac OS?
Solution 1:
diskutil(8) with the info predicate will give you information about a disk or partition.
Solution 2:
Highlight the volume in finder (note, that it must be the root of the volume), and hit cmd + i. The info dialog that appears shows you the filesystem type against the Format label.
Solution 3:
Running mount in Terminal.app also works and has way less noise when compared to diskutil info -all.