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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?

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up vote 6 down vote accepted

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

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

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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.

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