Blu-ray光盘使用蓝色激光技术实现数据存取，其单层数据容量达到了（ ）。
- A.4.7G
- B.15GB
- C.17GB
- D.25GB
正确答案及解析
正确答案
解析
蓝光（Blu-ray）或称蓝光盘（Blu-ray Disc，缩写为BD）利用波长较短（405nm）的蓝色激光读取和写入数据，并因此而得名。而传统DVD需要光头发出红色激光（波长为650nm ）来读取或写入数据，通常来说波长越短的激光，能够在单位面积上记录或读取更多的信息。因此，蓝光极大地提高了光盘的存储容量，对于光存储产品来说，蓝光提供了一个跳跃式发展的机会。
目前为止，蓝光是最先进的大容量光碟格式，BD激光技术的巨大进步，使你能够在一张单碟上存储25GB的文档文件。这是现有（单碟）DVDs的5倍。在速度上，蓝光允许1~2倍或者说每秒4.5~9兆字节的记录速度。
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