1. A file may be corrupted warning on a video file may either mean you can't play it or only be able to view a portion of it.

2. When you preview a file, it leaves a preview file in the incomplete folder. So this preview file will only be as large as it was when you previewed it. These files generally Preview at the beginning or end of the file name.

3. A video file that's only 11 MB is only going to last for a minute or 3. That's a very small video file. Movie files (full movies) are generally CD size like between 500 MB to 700 MB in size.