Is there a simple way to convert .mdf files to .dmg format.
There are numerous disk management utilities, such as AnyToISO or gBurner, are capable of easily converting .mdf to .dmg (Media Disc Image File to Apple Disk Image File).
By renaming .mdf to .iso, and mounting it on your Mac device, you can use the Disk Utility to convert the file to .dmg format.
A disk image converter for Microsoft Windows
Mac version of popular disk image converting program
One of the many CD/DVD burning tools