A file system includes a plurality of servers to store file data as segments or chunks; and first data that includes file identifiers for files for which the file data are stored as segments; and second data that maps the file identifiers to the segments to which the file identifiers correspond; and...http://www.google.com/patents/US8001096?utm_source=gb-gplus-sharePatent US8001096 - Computer file system using content-dependent file identifiers
