January 2015 Archives
January 28, 2015

MacOS X Yosemite: How to mount a disk on startup


MacOS X Yosemite removed few capabilities that existed in previous versions of MacOS X. Notably the StartupItems feature which allowed you to run scripts when the system boots up.

On my machine I want to be able to mount an internal disk as soon as the machine boots up, but before a user logs in. A common solution in the past involved a custom StartupItems script, but this no longer works on Yosemite.

To solve this problem I created a LaunchDaemons script. My disk's volume name is BigDisk and is accessible via /dev/disk0s2. To mount it on startup I created a file named com.jollyturns.disks.plist in /System/Library/LaunchDaemons with the following content:

<?xml version="1.0" encoding="UTF-8"?>
<plist version="1.0">




When the machine starts up, launchd will load the file since we have the RunAtLoad set to true. It then finds that /Volumes/BigDisk does not exist, since the disk is not yet mounted, so it executes the diskutil command to mount the directory.

Posted by ovidiu at 01:52 PM | Comments (0) |
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