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I have a volume mounted. If I switch to another user, this volume gets dismounted. The problem is that I want this volume to be available for every user (but putting it in their login items is not the solution I'm looking for), so: how can this behavior be prevented? (I'm on Mountain Lion)

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Are you mounting the volume manually after logging in? –  Graham Miln Aug 2 '12 at 11:43
    
Yes, that's what I do. –  user732274 Aug 2 '12 at 11:53
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1 Answer

up vote 1 down vote accepted

You can stop Mac OS X unmounting user disks on log-out. This behaviour is controlled with a default (preference).

In this discussion on the Apple Support Community, Király shares the appropriate command to issue:

defaults write /Library/Preferences/SystemConfiguration/autodiskmount AutomountDisksWithoutUserLogin -bool YES

This command needs to be entered into Applications > Utilities > Terminal.app. Aftwards you must restart your Mac for the change to take effect.

Note that the autodiskmount tool has been replaced by automountd; it is possible Mac OS X 10.8 has migrated this default to another file.

You may also find this Super User question useful, Automount external hard drive on Mac.

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