ISOBuddy is a small and free tool which can convert almost any image file format to ISO. It can convert image formats like: GI, NRG, CDI, MDF, IMG, B5I, B6I, DMG, PDI, BIN and CCD to .ISO image. Apart from converting, it lets you Erase CD/DVD and Burn ISO image files to CD/DVD disc.
Use the Open button to select the source image file and ‘Save as’ to chose the target file where you want to save the output file. To erase a disc, open extras and chose the erase disk option. Supports – Windows only.