Why is short clip from long original same file size?

Imported clip into imovie. Size 8.8 gb and 48 minutes in length. Cut a 20 second clip for use in different movie. Copy to desktop. File size for 20 second clip is same as original, 8.8 gb. Why?

It has to do with iMovie's nondestructive editing. I may not be expressing this exactly right, but here are the basics. When you edit in iMovie, the parts that you have cut from the file are not actually deleted. What you see in the timeline is the part of the file that you have chosen to use; the rest is retained. You always have the ability to revert to the original version. When you see the file size, you are viewing the size of the entire clip-the part you are using along with the part you cut.
If you want to save only the 20-second clip, export it as a QuickTime movie. You should then see a difference in the file size.
I hope this helps.

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