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To start you can only verify and repair the disk permissions of your boot drive.

When you download DVD Imager tou get .sit file. If you double-click on it you get DVD_Imager1.2.dmg (this is what you are trying to look up with Disk Utility). What you have to do is forget about Disk Utility and double-click on the DVD_Imager1.2.dmg on your desktop to mount it. Once this is done a finder window will come up with its contents (Readme file, source folder and DVD Imager application). You only have to drag the DVD Imager app. to your applications folder. Once you do that you can eject the DVD_Imager1.2 volume mounted on your Desktop.
To use DVD Imager application you only have to double-click on its icon in the Applications folder and the application will open. Now drag the video_ts folder to the top part of the DVD Imager window and click on create image.

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