The greater amount of information stored on a DVD is chiefly due to the smaller pit size and tighter track spacing,but another factor comes into play,namely compression.
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- 一张DVD能储存较大数量的信息,主要是因为光盘较小的凹坑和紧密的轨迹相间隔,但是另外一个因素也发挥了作用,即压缩。