Is it possible to ask Spotlight to not index a volume ?
Yes, open the Spotlight prefpane and under the Confidentiality tab (not sure, but on my French system it is called "Confidentialité"), you can add folders and volumes not to be indexed.
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There are a variety of options to do this:
- Add the drive to the "Privacy" tab in the Spotlight Preference Pane
- Turn off Spotlight indexing for the site from the command line:
sudo mdutil -i off /Volumes/NAME_OF_DRIVE
touch /Volumes/NAME_OF_DRIVE/.metadata_never_index
on an external drive.
If it's a removable volume, create a file in its root directory called .metadata_never_index, as in this hint.