Simplified file holography

I did some more thinking about my holographic filesystem ideas and some reading on coding theory and I realized that most of the complexity of the system actually comes from the desire to make it work for read-write.  If we design it more narrowly for read-only media like DVD-R discs, and tie less closely to the operating system's filesystem code, the result can be much more compatible and keep most of the advantages.  The new idea is that instead of being a full filesystem, it would come as two utilities:  one that appends extra redundant blocks to an existing filesystem image so that it will be more recoverable in the future, and another that performs the recovery.  If no blocks in the main image are lost, then the filesystem can be read normally by software that doesn't know about the recovery scheme, just ignoring the extra data at the end. [1762 words...]