The advent of Blu-ray technology has led to the introduction of high capacity storage discs to meet the demand cause by the rapid growth of high definition television (HDTV). Blu-ray discs get their name from blue laser technology. The shorter wavelength of the laser is the reason it is blue in colour. The blue laser has a wavelength of 405nm compared with the wavelength of 650nm for DVD which utilises red laser technology. The benefit of having a blue laser with a shorter wavelength means it is possible to write smaller data pits and therefore vastly increase the amount of data on the disc. Blu-ray discs offer 3 to 5 times the storage capacity of a standard recordable DVD disc, enabling the recording, rewriting and playback of high definition video (HD). For use only in drives or recorders that support 25GB/50GB Blu-ray Discs without cartridge. Verbatim's professional optical media feature tighter specifications than the standards given by the relevant standardisation bodies. Tighter specifications ensure better compatibility with writers and recorders. This results in higher recording quality, thus ensuring longer archival lifetime and better readability. You can recognise Verbatim's professional optical media by the DataLifePlus branding. This is a recordable disc with 25GB capacity compliant with Blu-ray Disc Alliance specifications. Laser Wavelength: 405nm. Hard Coat protective layer. Extremely long archival life. Excellent playback performance. BD-R is for use in BD writers and recorders. The Wide White Inkjet disc has a white surface for inkjet printing up to the hub with printable diameter 21-118mm.