Optimizing the recording on a rewritable interactive medium of revisions to an existing project on that medium

A method, comprising:

• providing a first version of an interactive media project on a consumer device;
• providing a second version of the interactive media project on a copy of the interactive medium;
• determining those portions of the first version that are contained in the second version;
• and
• writing the second version to the interactive media, wherein said portions contained in the second versions are maintained during the writing.

An electronic data file, on a storage medium, that when transferred into an appropriately configured digital apparatus causes the apparatus to operate in accordance with a process for forming an interactive media content compatible with a media protocol, the process comprising:

• opening in a consumer device a project stored as a media image on an interactive medium;
• performing a comparison between the project as opened and the project as edited on the consumer device;
• revising the media image of the opened project based on the comparison;
• and
• writing the revised media image to the interactive medium.