Source video in iMovie

Got some questions concerning iMovie 8:
1. When I try to trash "rejected clips", a dialogue box says I can't, and that I don't have enough disk space! I did empty the trash, as the instructions said. I am using an external hard drive to hold the source video.
2. While experimenting, I trashed a converted movie folder from the 'movie events' folder on the external hard drive (source video). The 'project' pane in iMovie for that movie now has little yellow triangles containing and exclamation point. What's with that?
3. Does trashing the event folders on my external hard drive have any effect on the 'project' files I've already created and shared in iMovie? I'd like to save some space on that drive.
Thanks in advance for helping!

1. When I try to trash "rejected clips", a dialogue box says I can't, and that I don't have enough disk >space! I did empty the trash, as the instructions said. I am using an external hard drive to hold the >source video.
Then you move rejected clips to trash, you can actually remove rejected frames from clip, while keeping the rest of the clip intact. So I would imagine, imovie would need to make a copy of the clip while writing out the frames that are being kept. May need space for that. Also, it may need a swap file depending on how much memory you have installed. If you have a bunch of applications open and it has been a while since you rebooted, you may not have room for another swapfile.
2. While experimenting, I trashed a converted movie folder from the 'movie events' folder on the >external hard drive (source video). The 'project' pane in iMovie for that movie now has little yellow >triangles containing and exclamation point. What's with that?
The iMovie project file contains no video. It is a text file that contains pointers to the Event file. Once the Event file is gone, there is nothing to point to. This means you can not do further edits on your project, and you cannot Share your project to additional formats. If you still need to work on your project, drag the Event from the trash back to where it was. If you don't, you can leave it in the trash. Deleting an Event will not trash any copies of your completed movie that you may have placed in the Media Browser or in iTunes.
3. Does trashing the event folders on my external hard drive have any effect on the 'project' files >I've already created and shared in iMovie? I'd like to save some space on that drive.
No. Trashing Event files does not impact project files.
You can delete Project files, but be aware that you are also deleting your Media Browser copy when you do this.

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