Is there a file somewhere in the System folder or in the Library that shows me which OS is installed on the disk?


You can read the SystemVersion.plist on that particular volume-


If there's a valid, bootable system on it, then it will be listed in System Preferences > Startup Disk, with its version number.

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  • Doesn't work for me. I see no system info for the external disks. – SPRBRN Aug 15 '20 at 11:55
  • @SPRBRN That's odd. See the screenshot I've added. – benwiggy Aug 15 '20 at 12:38
  • I see, but here it only shows the volume name. – SPRBRN Aug 15 '20 at 14:47
  • 1
    Could it mean those volumes are not bootable? – Steve Chambers Aug 15 '20 at 16:05
  • 2
    @SteveChambers - volumes are bootable, but encrypted. Maybe that's the issue here? – SPRBRN Aug 16 '20 at 15:10

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