osx-mount-drives-on-boot.md


        
            
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            By default, OS X only mounts external drives (USB, Firewire, Thunderbolt, etc.) when you log in, and unmounts them when you log out or reboot. To change this behavior, enable AutomountDisksWithoutUserLogin.
sudo defaults write /Library/Preferences/SystemConfiguration/autodiskmount AutomountDisksWithoutUserLogin -bool true
Installing OS X Server also enables this setting.
Alternatively, you can create the /Library/Preferences/SystemConfiguration/autodiskmount.plist with the following content:
<xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
    <dict>
        <key>AutomountDisksWithoutUserLogin</key>
        <true/>
    </dict>
</plist>
Thanks to The Tolis Group and Apple Discussions for providing the solution.