Optical Disc Type

"+" And "-" are the products of the Alliance's competition in the production of CD technology by several different companies. Later, the two major alliances developed relevant standards, "+" and "-" are used to distinguish between the two standard symbols. Directory recorders are basically compatible with these disks. CD-R: is a standard of one write, permanent read. CD-RW: erasable CD. DVD-R, fully called DVD-Recordable (Recordable DVD) DVD + R, which is defined as the Write once DVD (one Write DVD) DVD-RW, it is fully called a DVD-ReWritable (ReWritable DVD) DVD + RW, which is defined as a Re-recordable DVD ). Among them, CD-R, DVD-R, DVD + R are a write, permanent read disk, that is, once burned content can not change the above recorded content, and CD-RW, DVD + RW, DVD-RW, are erasable to write disk, after burning can also erase the above content again write data, but not only can erase a part, must be erased on the entire disk content. In addition to the above disks, it is common that the DVD +/-r dl is a single-sided Double-layer burning (DVD +/-Recordable Double layer) relative to the single-sided single-layer 4.7G ), has two storage layers, compared to the ordinary single-sided single-layer recorder storage capacity expanded to 8.5 GB, The DVD-RAM is all called the DVD-Random Access Memory (DVD Random Memory ). It was jointly developed by three companies that are at an edge in the battle for DVD standards. They are Panasonic, Hitachi, and Toshiba (MHT for short ). Similar to a hard disk, you can delete or modify a file on a disk, instead of a file error. Among them, DVD-RW and DVD + RW, DVD + RW has obvious advantages. CD-ROM, DVD-ROM refers to the optical drive, the optical drive with those disc symbols, indicating support for the disc.