Jettison是一款外部磁盘实用工具，如果您经常忘记在Mac电脑睡眠前弹出您的外部驱动器，这样会使外部驱动器损坏或者让外部驱动器出现错误，还有可能会丢失数据。而Jettison for Mac可以在您睡眠浅自动为您弹出，非常的优秀！
Jettison automatically ejects external disks from your Mac before your computer goes to sleep.
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.
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? will check to see if your drives are still connected and will mount them back on the Desktop if they’re there.
Compatibility: OS X 10.9 or later 64-bit