ISO is the abbreviation of International Organization for Standardization originated from Greek "ISOS" which means "Equal". Though non-governmental, ISO is still a very important global organization.
In reference to video, ISO refers to a file format of an optical disc such as CD, DVD or Blu-ray Disc. ISO actually owned its name from the ISO 9660 file system and is used together with CD-ROM media.
ISO image, or called an ISO file, is the image of an entire CD or DVD, the whole contents of which can be completely duplicated and contained in a single ISO file. ISO image is an image file produced by copying all information in an optical disc. Therefore, ISO image is qualified to be the genuine digital copy of the original. It usually has a file extension of .iso and might contain a UDF (ISO/IEC 13346) file system. One can create ISO image from optical disc, or further create optical disc using specific software.
1- Replicate CD/DVD by use of CD/DVD mastering programs, namely, further create a CD/DVD disc therefrom;
2- Write the disc image to hard drive once, and record the same several times to different CD/DVDs to save processing time. Simply speaking, it is only necessary to duplicate the CD/DVD once before creating DVDs from ISO file as many times as possible;
3- Create a disc image file to be written to CD/DVD on another system (UNIX, Macintosh);
4- Backup CD/DVD data. More actually, all data and contents can be copied such that ISO file can be taken as a backup;
5- Act as a virtual CD/DVD drive. ISO image file can be mounted to a virtual drive as if a physical disc was loaded in the drive or treated as a regular Compact Disc inside a computer while maintaining the original structure of CD/DVD, which is convenient for further DVD burning;
6- Transfer CD/DVD images over the Internet.
* One single file merged with multiple files
* Easy to burn
* Virtual disc acting like a physical one
* Unable to store and recreate CD-Audio discs
* Unable to be mounted to a USB flash drive
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