DVD CDs (0.74 µm for DVD versus 1.6 µm for CD), accounting in part for DVD's increased storage capacity. In comparison, Blu-ray Disc, the successor to the DVD format, uses a wavelength of 405 nm (violet), and one dual-layer disc has a 50 GB storage capacity. Read and write speeds for the first DVD drives and players were 1,385 kB/s (1,353 KiB/s); this speed is usually called "1×". More recent models, at 18× or 20×, have 18 or 20 times that speed. Note that for CD drives, 1× means 153.6 kB/s (150 KiB/s), about one-ninth as swift. DVD-Video is a standard
Optical Disc Archive will increase the cartridge capacity to 3.6TB, the read speed to 2Gbit/s and the write speed (with verification on) to 1Gbit/s. Sony Corporation and Panasonic Corporation on announced on 10 March 2014 their cooperation in producing a new media trademarked as Archival disc. The Archival disc media will be used in future Optical Disc Archive Media to achieve at least 6TB of storage. Optical Disc Archive Optical Disc Archive is a storage technology that was introduced by the Sony Corporation. It uses removable cartridges, where each cartridge holds 12 optical discs. Each of the internal optical discs is similar to,