Warning: Use of undefined constant title - assumed 'title' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/data/tmp/tempnews1.php on line 152 如何辨别移动u盘质量
- 分类:u盘教程 发布时间: Warning: Use of undefined constant newstime - assumed 'newstime' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/data/tmp/tempnews1.php on line 156 2013年04月24日 00:00:00
随着u盘的价格趋于平民化,很多朋友都给自己配了一个小巧的u盘。由于国家没有对芯片规定一个标准,造成市场上带次品芯片的U盘非常泛滥。市场上的u盘这么多,如何才能知道自己的u盘质量好坏呢。下面装机吧www.125315.com就来给大家介绍一下。
U盘芯片级别分为3种:
1、A+级
2、A级
3、B级
当然在读写速度、次数、功耗等方面,同种规格的A+级芯片自然要优于A级芯片,而A级芯片又优于B级芯片。
对于级别的评价标准,行业标准主要是依据闪存每单元的写入次数决定的,A级的Flash芯片可以使用10万次/每存储单元。另外低坏块率使A级Flash芯片的特点,行业里也把坏块率低于5%的Flash称为A级Flash,而高于5%的坏块率的Flash称为B级Flash。
目前市场上流行黑片、白片的说法,都是Downgrade Flash的类型,由于Flash制程和容量的提升,内部的构成越来越复杂。简单的说,黑片的概念主要用于芯片,白片的概念既用于芯片也用于闪存卡。芯片工厂淘汰的次品就是黑片,未打上工厂标和芯片型号,这样的芯片也很有可能通过各种渠道流通到市场,现在很多大厂U盘为了降低成本大量采购芯片厂选下的坏块多的芯片,然后通过技术处理,做成产品。白片则比黑片质量好一点,会被人为的给打上标志,但这也不是正规厂商打的标志。
有成百上千个芯片在一个晶圆上(u盘组成结构:http://www.kkzj.com/),晶圆生产好后,需要经过测试并把不好的芯片做上标记;买回未切割的晶圆的裸片的厂家会自己切割、邦定,标记为不好的芯片就会被丢弃;测试过的晶圆则会被送去切割封装,封装好后就是我们看到的带管脚的芯片了,在封装阶段标记为不好的芯片同样会被丢弃。通常情况下由于正规的测试流程是很费时的,因此有些晶圆厂会为了提高了成本,会把未经过测试的晶圆卖给需要裸片的厂家,由后者自己进行测试,对于后者的好处是可以买到较便宜的晶圆,但是会买未测试过晶园的厂家通常也都没有好的测试设备,又为了节省测试项目的成本,使得很多半导体厂不能通过的晶圆却制成了最终的成品,这也是造成产品质量不稳定的一个重要原因。
责任编辑:u.125315.com 版权所有,转载请说明出处!
U盘芯片级别分为3种:
1、A+级
2、A级
3、B级
当然在读写速度、次数、功耗等方面,同种规格的A+级芯片自然要优于A级芯片,而A级芯片又优于B级芯片。
对于级别的评价标准,行业标准主要是依据闪存每单元的写入次数决定的,A级的Flash芯片可以使用10万次/每存储单元。另外低坏块率使A级Flash芯片的特点,行业里也把坏块率低于5%的Flash称为A级Flash,而高于5%的坏块率的Flash称为B级Flash。
目前市场上流行黑片、白片的说法,都是Downgrade Flash的类型,由于Flash制程和容量的提升,内部的构成越来越复杂。简单的说,黑片的概念主要用于芯片,白片的概念既用于芯片也用于闪存卡。芯片工厂淘汰的次品就是黑片,未打上工厂标和芯片型号,这样的芯片也很有可能通过各种渠道流通到市场,现在很多大厂U盘为了降低成本大量采购芯片厂选下的坏块多的芯片,然后通过技术处理,做成产品。白片则比黑片质量好一点,会被人为的给打上标志,但这也不是正规厂商打的标志。
有成百上千个芯片在一个晶圆上(u盘组成结构:http://www.kkzj.com/),晶圆生产好后,需要经过测试并把不好的芯片做上标记;买回未切割的晶圆的裸片的厂家会自己切割、邦定,标记为不好的芯片就会被丢弃;测试过的晶圆则会被送去切割封装,封装好后就是我们看到的带管脚的芯片了,在封装阶段标记为不好的芯片同样会被丢弃。通常情况下由于正规的测试流程是很费时的,因此有些晶圆厂会为了提高了成本,会把未经过测试的晶圆卖给需要裸片的厂家,由后者自己进行测试,对于后者的好处是可以买到较便宜的晶圆,但是会买未测试过晶园的厂家通常也都没有好的测试设备,又为了节省测试项目的成本,使得很多半导体厂不能通过的晶圆却制成了最终的成品,这也是造成产品质量不稳定的一个重要原因。
责任编辑:u.125315.com 版权所有,转载请说明出处!
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winPE系统安装win7失败 试试这个方法
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修复U盘MINI USB接口的方法
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