Click the "Normal Compression" or "Standard Compression" option unless you need to shrink the size of the ISO image file dramatically.

Disk image files in ISO format have mostly replaced old-fashioned shiny disks. Windows 10 includes the ability to mount any ISO file as a virtual DVD. To unmount the file, you need to use a ...

An ISO file is a digital copy of a disk image that has been extracted from physical media. Creating ISOs is a great way to archive physical discs, which are likely to degrade over time.