Editing Optical disc image (section)

{{short description|Archive file of an optical disc}}
{{Multiple issues|
{{More citations needed|date=August 2011}}
{{Original research|date=November 2020}}
{{Essay-like|date=November 2020}}
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{{ infobox file format
| name          = ISO 9660 image
| mime          = application/vnd.efi.iso<ref>{{cite web |last1=Siyuan |first1=Fu |title=application/vnd.efi.iso |url=https://www.iana.org/assignments/media-types/application/vnd.efi.iso |publisher=[[IANA]] |access-date=18 July 2023 |date=24 January 2017}}</ref>
| magic         = [[ISO 9660#Volume descriptor|Volume descriptor]]: {{code|CD001}} at 32769. {{code|NSR0}} at 38913 or 32769 for UDF.<ref>{{cite web |title=File Signatures |url=https://www.garykessler.net/library/file_sigs.html |website=www.garykessler.net |access-date=2020-07-01 |archive-date=2020-07-03 |archive-url=https://web.archive.org/web/20200703084445/https://www.garykessler.net/library/file_sigs.html |url-status=live }}</ref>
| standard      = [[ISO 9660]], [[Universal Disk Format|UDF]]
| extensions    = .iso, .udf
| url           = 
| type code     = 
| uniform type  = public.iso-image
| owner         = 
| genre         = [[Disk image]]
| container for = 
| contained by  = 
| extended from = 
| extended to   = 
}}

An '''optical disc image''' (or '''ISO image''', from the [[ISO 9660]] file system used with [[CD-ROM]] media) is a [[disk image]] that contains everything that would be written to an [[optical disc]], [[disk sector]] by disc sector, including the optical disc [[file system]].<ref>{{cite web | url=https://www.lifewire.com/iso-file-2625923 | title=What Is an ISO File? | website=Lifewire | date=24 April 2018 | last=Fisher | first=Tim | access-date=23 June 2018 | archive-date=23 June 2018 | archive-url=https://web.archive.org/web/20180623113439/https://www.lifewire.com/iso-file-2625923 | url-status=live }}</ref> ISO images contain the binary image of an optical media [[file system]] (usually [[ISO 9660]] and its extensions or [[Universal Disk Format|UDF]]), including the data in its files in binary format, copied exactly as they were stored on the disc. The data inside the ISO image will be structured according to the file system that was used on the optical disc from which it was created.

ISO images can be created from optical discs by [[Comparison of disc image software|disk imaging software]], or from a collection of [[computer file|files]] by [[optical disc authoring software]], or from a different [[disk image#File formats|disk image file]] by means of [[data conversion|conversion]]. Software distributed on bootable discs is often available for download in ISO image format; like any other ISO image, it may be written to an optical disc such as CD, DVD and Blu-Ray.