1.光盘存贮器本文主要介绍光盘存贮器(光盘)。这种存贮器的一面或两面,按直径大小不同(12～30厘米)可制备约20000～50000条螺旋形轨迹,带有微细的信息槽。这些信息槽在光盘高速旋转时,用聚焦成直径约1微米的激光束读出。通常,光盘存贮器可以分为三种类型:ROM(只读存贮器,如视盘或所谓袖珍声盘),DRAW(写后直读,已处于试用阶段)及E-DRAW(可擦式写后直读,处于继续发展阶段)。 1. CD-ROM This article focuses on the CD-ROM memory (CD-ROM). Depending on the diameter (12-30 cm), about 20,000 to 50,000 spiral tracks can be prepared on one or both sides of this memory with a fine information slot. These grooves are read out with a laser beam focused to about 1 micron in diameter as the disc rotates at high speed. In general, there are three types of optical disk storage: ROM (read only memory, such as video disk or so-called compact disk), DRAW (direct reading after writing, already in trial phase) and E-DRAW Write direct reading, in the continued development stage).