翻译:Compact Disc---Interactive (CD-I)


1994-07-15

        New programs and data are 'burnt' onto the disc surface as dips by a strong laser. A weaker laser is passed over the surface and the reflected distortion from the dips forms the data.
        At present it is difficult to erase the contents and return to a perfectly smooth disc surface. The WORM (Write Once Read Many Times) thchnique overcomes this by writing new or revised data onto unused parts of the disc and making any previons contents inaccessible, thus giving the appearance of resavign programs or data. Since compact discs have a 600 megabyte capacity, it can be a long time before a disc is used up and a new one required.
        交互式光盘
        一种既允许读又允许写，从而可与用户交互对话的光盘(直径约5英寸的光盘)。
        用强的激光束把新的程序和数据以光的形式烧结在盘的表面。较弱的激光束射到表面时从坑中反射的失真就代表数据。
        目前很难把盘上烧结的内容擦除而使盘的表面完全恢复平滑。WORM(一次写多次读)技术为了克服这一点采用把新的或修改了的数据写到盘的未使用的部分而使任何以前的内容不能访问，从而看上去像重新保存了程序或数据一样。由于光盘的容量为600MB，一张光盘可以使用很久才需更换新盘。
 
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