.ISO image

An ISO image (.iso) is an informal term for a disk image of an ISO 9660 file system. More loosely, it refers to any optical disk image, or even a UDF image.

As is typical for disk images, in addition to the data files that are contained in the ISO image, it also contains all the filesystem metadata (boot code, structures, and attributes). All of this information is contained in a single file. These properties make it an attractive alternative to physical media for the distribution of software that requires this additional information as it is simple to retrieve over the Internet.

Romeo Burner can deal with ISO images: producing them either by copying the data from existing media or generating new ones from existing files, or using them to create a copy on physical media.

It is also allowed in most operating systems (including Mac OS, Mac OS X, BSD, Linux, and Windows with Microsoft Virtual CD-ROM panel) for these images to be mounted as if they were physical disks, making them useful as a universal archive format. Better performance is achieved by running an ISO since there is no waiting for the drive to be ready and the hard drive I/O speed is many times faster than the CD/DVD drive.

A copy of CD contents, stored as an .iso file, is made by this way: the ripper searches for the sectors of the CD that have been used, say 251,000 for instance (there are 330,000 sectors on a 74 min CD and 360,000 sectors on an 80 min CD). Each sector is copied to the .ISO file, one by one. For CDs each sector is 2048 bytes, the .ISO file should then be of size 251,000 x 2048 = 514,408,000 bytes.

.NRG image

A .nrg file is a proprietary CD image file format used by Nero Burning ROM, a utility suite made by Nero AG, to create and burn ISO 9660 CD images.

Other than Nero Burning ROM there is a variety of software titles that can make use of these image files. For example, Alcohol 120% or Daemon Tools can mount NRG files onto virtual drives for reading.

Contrary to popular belief .nrg files are not ISO images with .nrg extension and a header attached.

Additional disc images information