Source : Free On-Line Dictionary of Computing

packet writing
     
         A technique for writing {CD-R}s and {CD-RW}s that is
        more efficient in both disk space used and the time it takes
        to write the CD.
     
        {Adaptec}'s DirectCD is a packet writing recorder for {Windows
        95} and {Windows NT} that uses the {UDF} version 1.5 file
        system.
     
        [Is this true?  How does it work?]
     
        (1999-09-01)