Is it possible to rewrite CD-R, DVD-R, Bluray-R discs?
They cannot be rewritten.
Recording on DVD-R discs is accomplished through the use of a dye recording layer that is permanently transformed by a highly focused red laser beam.
Recording on DVD-R discs is accomplished through the use of a dye recording layer that is permanently transformed by a highly focused red laser beam. This dye substance is spin-coated onto a clear polycarbonate substrate that forms one side of the body of a complete disc. The substrate is injection moulded, and has a microscopic, pre-grooved spiral track formed onto its surface. This groove is used by a DVD-R drive to guide the recording laser beam during the writing process, and also contains recorded information after writing is completed. An undulating wobble signal is moulded into the pre-groove for synchronising a DVD-R drive’s spindle motor during the writing process, and Land Pre-Pits (LPP) are also contained in the land areas between grooves for addressing purposes. A thin layer of metal is then sputtered onto the recording layer so that a reading laser can be reflected off the disc during playback. A protective layer is then applied to the metal surface, which prepares the side for the bonding process.