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Avoid automatically mounting of external disks on wake up
I have an external disk, which I only use once per day for a couple of minutes. For reasons, I don't want to keep the disk always mounted, so I have a script, which automatically mounts the disk, does its thing and then unmounts the disk. The cable stays plugged in.
diskutil mount Quack
# doing stuff
diskutil eject /Volumes/Quack
In the past, this worked perfectly fine. Even if the computer went to sleep, the disk would stay unmounted after wake up. However since the update to macOS 26.4, the disk will automatically be mounted when the computer wakes up from sleep. Is there any way to avoid this?
1 answer
The following users marked this post as Works for me:
| User | Comment | Date |
|---|---|---|
| samcarter | (no comment) | May 25, 2026 at 19:30 |
This problem seems to have been fixed in macOS 26.5. The workaround below should no longer be necessary.
As a workaround, I'm using hammerspoon to automatically re-eject the disk after waking up:
wakeUpWatcher = nil
wakeUpWatcher = hs.caffeinate.watcher.new(function(eventType)
if eventType == hs.caffeinate.watcher.systemDidWake then
os.execute("diskutil eject /Volumes/Quack")
end
end)
wakeUpWatcher:start()
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