I have an external drive hooked up to my Mac, and I'm trying to determine things like, e.g., is this HFS or FAT, is it 32-bit or 64-bit, etc. It seems like there should be some trivial command that gives me this info, but I can't seem to find one. Ideas?

5 Answers 5


diskutil(8) with the info predicate will give you information about a disk or partition.

  • link is dead mate
    – Theo
    Jun 26, 2018 at 9:22
  • 2
    diskutil list also shows all available drives and volumes with their type (file-system).
    – Robert
    Nov 27, 2018 at 10:04
  • 2
    diskutil info -all
    – Shayan
    Oct 20, 2019 at 22:48

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.


Running mount in Terminal.app also works and has way less noise when compared to diskutil info -all.

  • 2
    it works, but output is a bit ugly though.
    – pdwalker
    Oct 28, 2019 at 6:56
  • mount | column -t makes it less visually dense. Nov 20, 2019 at 20:15

Unless you're wedded to doing it from the command line, use Disk Utility and it's "Info" button.


The 'mount' will show the filesystem type.

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