Alcohol 120° is an application allowing to create backups of your CD or DVD in the form of disk images (ISO images). It also supplies an emulator of CD-ROM driver, allowing to create a virtual reader from a disk image. Therefore, it is not necessary any more to burn the ISO image to be able to use it. It also supplies an emulator of CD-ROM drive, allowing to create a virtual reader from an image disk. It is thus more necessary to engrave(burn) the image ISO to be able to use him(it).
Its free equivalent is Daemon Tools for the reader emulation of CD / DVD, CD Burner XP pro, ISO to Recorder or BurnAtOnce for the creation of ISO images.