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Many times, it's nice to be able to re-purpose old machines for specific functions. One such function, in my case, is a CrashPlan Storage Server (with the new PROe). However, if that machine came with Mac OS X (not server), then external drives are unmounted by default upon user logout.
Below is a little trick that tells the OS to keep drives mounted in OS X client while logged out.
Create (touch) the following file:
sudo touch /Library/Preferences/SystemConfiguration/autodiskmount.plist
Edit the file, and add the following content:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
Save the file, and restart - now your external drives will mount automatically without having to log in.