<span>Encapsulation is defined as the process of adding a header in front of data supplied by a higher layer (and possibly adding a trailer as well).</span>
They are several weaknesses or disadvantages of file processing
systems but the major weakness is data redundancy and inconsistency. By data
redundancy, I mean duplication of data. There are no better methods to validate
insertion of duplicate data in file systems. Data redundancy can also increase
the chance for errors.