Jettison

What is Jettison?

Jettison is a macOS utility from St. Clair Software that helps protect external drives during everyday sleep and wake use. It automatically ejects external disks before your Mac goes to sleep, then remounts them when the Mac wakes up again. This is useful for MacBook users who often close the lid while portable drives, backup disks, or other external storage are still connected. Jettison can also give you quick menu bar controls for ejecting disks and putting the Mac to sleep in one step. Its main role is to make drive handling more convenient and reduce the chances of disconnecting storage unsafely during normal Mac workflows.

Key features

• Automatically eject external disks before your Mac goes to sleep
• Remount previously ejected disks after the Mac wakes up
• Eject disks and put the Mac to sleep in one step
• Control drive handling from a menu bar item
• Help reduce improper disconnects with portable and desktop external storage

Safety overview

Status: Safe

Jettison is a legitimate Mac utility for managing external disks around sleep and wake. Its behavior is consistent with its purpose: it monitors sleep events and works with connected storage so disks can be ejected cleanly. Removing it will stop that automation, which may make external-drive handling less convenient but should not harm your Mac. As with any disk utility, avoid forcing drive removal while files are still being copied or backups are still running.

Recommendation: Keep Jettison if you regularly use external drives and want automatic ejection before sleep. If you no longer use that workflow, you can remove it without affecting macOS beyond losing its drive-management convenience.

Common paths

• /Applications/Jettison.app

Related apps

• Default Folder X
• App Tamer
• HistoryHound
• Go64

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