Along with the large capacity hard disk popularity,  people were already used to copying compact discs to
CD/DVD image files, generally used  is the famous ISO 9660 international standards format, therefore CD/DVD

image files are called ISO files. Because the ISO file retained complete data information of the compact disc
(including compact disc boot information), you were allowed the convenience to use commonly used CD/DVD burning
software (for example Nero-Burning ROM ) to record the disc with your CD-R/RW or DVD-R/RW over and over forever,
it can also be used directly through Virtual CD/DVD-ROM drive software (for example Daemon-Tools ) .

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