How can I see which macOS version is installed on an external disk, without booting into it?

apple.stackexchange https://apple.stackexchange.com/questions/399380

  •  29-05-2021
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Question

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

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Solution

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

/Volumes/<volume_name>/System/Library/CoreServices/SystemVersion.plist

OTHER TIPS

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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