A Delta ISO is used to update an

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 primaril ...

files. It makes use of DeltaRPMs (a form of

Delta compression Delta encoding is a way of storing or transmitting data in the form of '' differences'' (deltas) between sequential data rather than complete files; more generally this is known as data differencing. Delta encoding is sometimes called delta compre ...

) for RPMs which have changed between the old and new versions of the ISO. Delta ISOs can save disk space and download time, as a Delta ISO only contains the things that were updated in the new version of the ISO. After downloading the Delta ISO, a user can use it to update the outdated ISO. 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 make use of this technique.

External links

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