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To download Jettison from the Mac App Store, you need a Mac with OS X 10.6.6 or later. Learn More.


By St. Clair Software

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MacWorld •••• (4 stars!) : Jettison automatically ejects external disks before your Mac sleeps and remounts them when it wakes. ** PLEASE TRY THE DEMO ON OUR WEBSITE TO MAKE SURE JETTISON WORKS WITH YOUR DISKS **

Simplify those last few seconds when you grab your MacBook and run out the door. Just close the lid and Jettison will automatically eject your backup drive, iPod, or whatever is connected so you can safely unplug it. Say goodbye to "disk was not ejected properly" errors and waking your computer back up because you forgot to eject everything.

Jettison even makes sure that Time Machine backups and file server volumes are properly shut down before they're removed. Your backups and shared files are safe and sound.

And what if you decide not to leave, and open your MacBook back up? Jettison will check to see if your drives are still connected and will mount them back on the Desktop if they're there.

What's New in Version 1.2.4

Corrected issues with Mac OS 10.8. Please see our website for a demo version, additional updates and SD card support.


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Customer Reviews

Works fine for me

I am revising my previous review as I have discovered that it was my hardware was causing a glitch. This app works fine on my iMac i7 and my MacBook Pro C2D, the problem I had was with a drive that did not implement the power managment features of the Macs properly. I wanted this because I kept returning to my desktop after a break to find the dreaded warning, now I can just resume where I left off, having replaced the drive enclosure with a more up-to-date one. St Claire were tireless in helping to isolate this glitch always helpful, supportive and courteous.

An app is good if it solves a problem or improves workflow this does both.

Just what I didn't know I needed!

I thought the 'drive did not eject properly' message was just a glitch due to the hard drive I was using for Time Machine. Now my Time Machine and my other external drive both seem to eject and re-mount fine. What a relief! Note: if the drives were ejected prior to shutting down or sleeping then it DOES NOT remount them on waking.

Works, but no audible notification

I was expecting an audible notification that it had ejected the drives and they were safe to remove, but the audible notification doesn't work on the Mountain Lion :(

View in Mac App Store
  • £3.99
  • Category: Utilities
  • Updated:
  • Version: 1.2.4
  • Size: 1.1 MB
  • Languages: English, French
  • Developer:

Compatibility: OS X 10.6 or later

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