A delta ISO is used to update an existing

ISO image 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. IS ...

which contains

RPM Package Manager RPM Package Manager (RPM) (originally Red Hat Package Manager, now a recursive acronym) is a free and open-source package management system. The name RPM refers to the file format and the package manager program itself. RPM was intended primar ...

(RPM) files. It utilizes DeltaRPMs, a form of delta compression, for RPMs which have changed between the old and new versions of the ISO. Delta ISOs help save disk space and reduce download times, as they include only the files that have been updated in the new version of the ISO, a user can apply it to update the outdated ISO. This technique is used by some RPM-based Linux distributions, such as

Fedora A fedora () is a hat with a soft brim and indented crown.Kilgour, Ruth Edwards (1958). ''A Pageant of Hats Ancient and Modern''. R. M. McBride Company. It is typically creased lengthwise down the crown and "pinched" near the front on both sides ...

and

openSUSE openSUSE () is a free and open-source software, free and open-source Linux distribution developed by the openSUSE project. It is offered in two main variations: ''Tumbleweed'', an upstream rolling release distribution, and ''Leap'', a stable r ...

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Fedora

openSUSE
Linux package management-related software SUSE Linux {{Install-software-stub