Delta ISO

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A Delta ISO is used to update outdated ISOs. This can save you lots of disk space and download time, since a Delta ISO only contains the things that were updated in the new version of the ISO. After you've downloaded the Delta ISO, you can use it to update the outdated ISO. Some Linux distributions such as openSUSE make use of this technique.

[edit] Applying Delta ISOs

First, you'll need to download and install the Linux package deltarpm. Open a terminal and enter the following command:

applydeltaiso oldISO deltaISO newISO

Of course, you'll need to replace oldISO, deltaISO and newISO with the appropriate file names. This program is also available for Windows and can be downloaded on this page.