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光媒体目前有三种规格:光盘、光带、光卡。其中,光盘占支配地位,最大直径14英寸,新型索尼小型光盘直径只有2.5英寸。光盘有三个系列,它们是只读存取光盘(ROM),写一次读多次光盘(WORM),可重写光盘。还有复合(杂交)媒体. ROM媒体包括一个支持体如聚碳酸酯,上面涂以反射铝层和一个保护层。铝涂层上有负载信息的槽,用来散射照到铝涂层上的激光,以免激光反射到检波器上。激光透过支持体读取信息这种方式称为支持体透入型。这种类型的媒体包括大家熟悉的激光唱盘及各种规格的激光唱盘只读存取光盘(CD-ROM)。
There are three optical media specifications: CD-ROM, light belt, light card. Among them, the dominant position of the disc, the largest diameter of 14 inches, the new Sony compact disc diameter of only 2.5 inches. There are three series of discs, which are read-only optical discs (ROMs), write-once optical discs (WORMs), rewritable discs. There are also composite (hybrid) media. The ROM media includes a support such as polycarbonate coated with a reflective aluminum layer and a protective layer. The aluminum coating has a load cell slot to scatter the laser light onto the aluminum coating to prevent the laser from reflecting the detector. The way that the laser reads information through the support is called a support penetration. This type of media includes a well-known compact disc and a variety of compact disc compact discs (CD-ROMs).