High Quality Content by WIKIPEDIA articles! Packet writing or IPW (original term: Incremental Packet Writing), is an optical disc recording technology used to allow write-once and rewritable CD and DVD media to be used in a similar manner to a floppy disk from within the operating system, i.e., it allows users to create, modify, and delete files and directories on demand without the need to burn a whole disc. Packet writing technology achieves this by writing data in incremental blocks rather than in a single block. The most common file system for packet writing systems is the UDF format.