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ND即Minidisk，翻译成中文就是“迷你光盘”。MD碟片的直径为 6．4cm，比CD的12cm几乎小了一半，因此MD播放机可以轻松放进口袋里。MD最大的卖点在于其拥有接近于CD的声音回放品质的同时又具有录音功能，而且其录音的质量也同样的完美。在录音方面，它采用了ATRAC压缩算法，压缩比是1：5，相对于前一段时间在市场上大红大紫的MP3播放器的1：10的压缩比来说，MD在声音还原程度上要强了很多，这也意味着它的声音将更加的甜美。此外，MD的外形灵巧，比它的同门师兄Diskman更加便于携带。应该说：MD是迄今为止“随声听”家族中最完美的杰作。 MD与MP3到底孰优孰劣一直是朋友们不断争论的话题，但是今天我们暂且把这个问题放在一边。此文仅献给想买MD，或是对MD感兴趣的读者，希望对大家能有所帮助。
ND that Minidisk, translated into Chinese is “mini-disc.” The MD disc is 6.4cm in diameter, almost half the size of a CD of 12cm, so the MD player can fit easily into your pocket. MD’s biggest selling point is that it has a CD-like sound playback quality at the same time with the recording function, and its recording quality is equally perfect. In recording, it uses the ATRAC compression algorithm, the compression ratio is 1: 5, compared with the previous period on the market’s mammoth MP3 player compression ratio of 1:10, MD in the degree of sound reduction to be stronger A lot, which also means that its voice will be more sweet. In addition, the dexterity of the MD is more portable than its fellow doorman Diskman. It should be said that MD is by far the perfect masterpiece in the Walkman family. MD and MP3 in the end is one of the best friends has been a topic of constant debate, but today we put aside this issue for the time being. This article is dedicated to want to buy MD, MD or readers interested, I hope everyone can help.