Disable Spotlight on External Drives
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To have mds ignore all external volumes including network volumes run the following command:
$ sudo defaults write /Library/Preferences/com.apple.SpotlightServer.plist ExternalVolumesIgnore -bool True
To be able to re-enable indexing for certain external volumes, run this command instead:
$ sudo defaults write /Library/Preferences/com.apple.SpotlightServer.plist ExternalVolumesDefaultOff -bool True
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