TDK CD-RW74 discs are rewritable media that allow users to overwrite data directly and repeatedly, and are playable on all CD-ROM drives equipped with MultiRead functionality. They feature a storage capacity of up to 650MB, or 74 minutes of high-quality digital audio recording time. TDK CD-RW74 discs comply fully with Orange Book Part III specifications.TDK CD-RW74 discs utilize an exceptionally stable phase-change recording material to allow numerous rewrites and long archival life. Phase-change recording uses a laser to change the reflectivity of discrete areas on a disc surface. The recorded marks differ in their reflectivity from the unrecorded areas of the CD-RW disc. These differences in reflectivity are read by a laser pickup as digital data.TDK CD-RW discs are engineered to the most exacting tolerances, for optimum reliability and durability. Certified Plus CD-RW discs are ideally suited to a wide variety of applications where repeated re-recording may be desirable, such as data backup, pre-mastering, video and audio recording, multimedia development and more.