An “ISO” is a disc image format common on Windows/Linux. Converting Lion’s DMG to ISO is technically possible with third-party tools, but .
While Apple distributed Lion as an application bundle ( Install Mac OS X Lion.app ) and later provided a USB thumb drive option for $69, the community standard for backup and virtualization became the ISO image. An ISO file is a sector-by-sector copy of a disk, typically used for optical media. mac os x lion iso