If any of the video, music, and other media in a project is stored on a hard disk other than the one on which the project itself is stored, you can consolidate all the media used in the project onto the same disk as the project.
Consolidating a project’s media makes it easy to collect a complete project on your computer or on one disk so that you can then edit the project from any computer that has iMovie installed.
To consolidate a project’s media:
Connect all external hard disks containing your project media to your computer.
Open the project or select it in the Project Library, and then choose File > Consolidate Media.
The File menu appears in a light gray bar across the top of your computer screen.
Note: If the Consolidate Media menu item is dimmed, all of the media used in your project is already on the same disk as the project.
Do one of the following:
To copy Events that contain clips used in the project to the same disk as the project, click “Copy the Events.”
To copy only the video in the clips used in the project to the same disk as the project, click “Copy the clips.”
To move Events that contain clips used in the project to the same disk as the project, click “Move the Events.” The Events are deleted from their previous locations.
In all three cases, any iTunes songs used in the project are also copied to the same disk as the project.