What are the differences between DVD-R / RW, DVD+R / RW and DVD-RAM?
•DVD-R / RW: leads by Pioneer and Sharp •DVD+R / RW: leads by Sony, Philips and HP •DVD-RAM: leads by Panasonic, Toshiba and Hitachi DVD-RAM DVD-RAM uses Zone Constant Linear Velocity (also known as Z-CLV) for reading. It divides the disc into several districts and arranges in a spiral way. Each district contains several sectors. Each sector has its own physical address. Therefore, it uses the same “Data Random Storage” as HDD, which also provides burning repetition. DVD-R / RW Its burning principle is similar to CD-R / RW, which uses Constant Linear Velocity (also known as CLV). A DVD-R can only be burned once. But DVD-RW uses “Phase Change” burning technology; therefore, it can be re-burned. DVD+R / RW DVD+R / RW are the same as DVD-RAM, but it also provides Constant Angular Velocity (also known as CAV) for burning, where the device must maintain at a constant speed during burning processes. If it fails to do so, the burning processes must be stopped or else the disc may not be read
