One useful feature in OS X is support for disk images. These are container files that commonly end in the .dmg suffix, which represent virtual disks to the operating system when opened. By double-clicking these files, the system will mount them just as if you attached an external drive, and then allow you to copy files to and from them.
While most disk images you encounter will be from a developer or other third-party distributer, you can also create your own using Apple’s Disk Utility program. Continue reading