What is hdiejectd?
hdiejectd is a small helper process for disk images on macOS.
What is hdiejectd?
hdiejectd stands for "HDI eject daemon". HDI is the macOS disk image system. This process handles ejecting (unmounting and removing) mounted disk images, the virtual drives you see when you open .dmg files.
When does it run?
hdiejectd runs when:
- You drag a mounted disk image to the Bin to eject it
- You right-click a mounted disk image in Finder and choose "Eject"
- You click the eject button next to a disk image in the Finder sidebar
- An app asks for a disk image to be unmounted
What happens during ejection?
When you eject a disk image, hdiejectd:
- Checks that no files on the disk image are still open
- Writes any pending changes
- Unmounts the volume
- Removes the disk image from the system
If a file on the disk image is still open, you will get the "disk image in use" warning.
Does it use many resources?
No. It runs briefly during ejection and is otherwise idle.
Should you worry?
No. It is a normal macOS process for safely removing disk images.
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