Hello everyone! I've been working on this issue for almost a week now and am really struggling. This forum seems to be one of the best Mac communities so I'm hopeful. I have read multiple tutorials on how to move iMovie libraries to an external drive and have followed the instructions here. I'm not really sure what all I even need, but I just want my wife to be able to store her videos on her external hard drive. I'm not even sure what the difference between the library, projects, and events are. When I tried the above instructions it only moved the library, and the new library was around 40GB, but the one on her Macbook Air was close to 75GB. Also, her "Record Voiceover" feature stopped working when she tried to use it on the library on the external hard drive. It said it recorded, but then had the yellow exclamation point and would not play sound. Any help is greatly appreciated. I am happy to provide any more details as needed. Thanks again!