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U盘芯片的那些小常识

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　　在购买U盘的时候，相信很多朋友都一样，都只关注U盘的容量和价格，却忽视了U盘的芯片质量问题，往往忽略的才是最重要的，其实芯片才是U盘的核心元器件，多了解些U盘芯片的小常识，对你购买U盘会有很大的帮助。

　　一、u盘存储的核心元器件是被称为"FLASH 闪存"的芯片，它的成本决定了成品U盘的价格高低，市场上各式各样的、各种品牌的U盘产品之所以表现出不同价格档次，很大程度上就是因为使用的 "FLASH 闪存"芯片存在差异。

　　二、闪存芯片分为正品闪存、黑片闪存等

　　1、正品闪存是指正规品牌闪存，一般为韩国、日本工厂品牌，如"三星"、"现代"、"日立"等;用作品牌U盘使用的闪存主要是"现代"、"美光";"三星"高速闪存价格比这两个品牌高出20元左右，一般用于高端MP3、MP4。而U盘大量使用的"现代"与"美光"两个品牌价格基本趋同。

　　2、所谓"黑片"，大体上有两种，一是指三星、东芝、现代等厂商淘汰下来的残次产品，二是指市场上回收的二手闪存芯片。由于芯片厂商在生产闪存芯片时，晶圆生产下来都分等级的，可分为99%容量、97%容量、93%容量等。等级低于93%容量以下的晶圆都不再打上原厂的标志销售，但也不会被扔掉，就流入台湾或内地的小封装厂，流到黑芯片市场。一些厂商正是利用低等级的晶圆，经过打磨后，贴上三星或现代的LOGO后出来卖。这些不符合标准的芯片成本低廉，但基本上可以使用，只是容量偏少。但是流入黑芯片市场之后，由于做黑芯片的人没有相应的技术能力，没能把芯片的坏块屏蔽起来，所以，坏区很容易扩散。更惊心触目的是，有些厂家暗地里在芯片中做手脚，直接用 64MB芯片做128MB产品，用128MB芯片做256MB产品，这些芯片称为"升级片"，然后利用软件欺骗系统，从而牟取暴利，一般的消费者很难识别真伪。

　　3、目前芯片产品又开始趋于多样化。比如同是"现代"512M芯片，就分为三种，同是1G的，又有别的区分，它们价格可能相差10到20元;同为三星1G芯片，分为两种，价格相差20到40元左右，它们的差别在于传输速度、容量的区别。一般价格偏低的U盘，您就得多想想了，很有可能就使用了黑片、升级片;质量才是信誉的保证，为了保障您的数据无忧，请购买正规品牌U盘。

　　U盘的容量、U盘的价格这些是在购买U盘时的初步认识，要想买到实用的、使用的U盘，用户要关注的是U盘芯片的质量问题，这才是构成U盘的核心部件。你选购U盘的方法对了吗?

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