Constricting an ISO image, as well as some extra file on computer, can be done extremely simply because computer previously has built in tool that compresses files for you. When a file is compressed, it is stored in a way that it cannot be opened. For example, when you compress an ISO image file, you cannot access it until you decompress it.

Instructions:

• Entrance directory where ISO images are stored.

• Right click ISO image and open "Properties."

• Click "Advanced" in Properties and place ensure in box next to "Compress Contents to save disk space." Click "Apply" to save changes and then click "OK" to close the window.