US Patent 7849257 Method and apparatus for storing and retrieving data

A method and apparatus for storing and retrieving data. The embodiment may maintain all previously-written data in a portion of a storage device, such as a hard disk, writable optical media, or memory, for an indefinite period. Old data is not overwritten unless the storage capacity of the storage device is exceeded. Accordingly, prior versions of data may be accessed by the embodiment as desired.