Mac storage basics · Disks, APFS and formats

Why does my Mac say a disk can't be ejected because it's in use?

Short answer: An app still has a file open on the drive (a document, media library, indexing or backup). Quit those apps and close Finder windows; Force Eject risks unsaved changes.

An app still has a file open on the drive — often a document, a media library, Spotlight indexing, or a backup running.

  1. Quit apps that may have files open from the drive.
  2. Close Finder windows showing it.
  3. Try again; macOS sometimes offers Force Eject, which risks losing unsaved changes in the app using it.

If it keeps happening, logging out or restarting releases the drive safely. Storage Studio's eject dialog lists what's still using the drive when it can tell.

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