For those looking for the performance and stability of DVD-Recordable media, but want the flexibility to add to or overwrite their data, music or video, DVD Re-Writable discs are the solution. These discs offer 4.7GB or 120 minutes of DVD-quality storage capacity with up to 6X write speed and are re-writable up to 1,000 times. Super Eutectic Recording Layer (SERL) optimizes read/write performance and durability. Most DVD writers and readers use these discs interchangeably though supported writing speeds may be different. To be certain you don't encounter compatibility issues, it is recommended that you purchase DVD-RW media in the same format as your DVD ROM drive.