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U盘坏块的概念及与扩容盘的关系

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　　小白用户对U盘有很多地方不了解，尤其是关于U盘故障的一些问题。最近小编收到一个网友的询问：什么是U盘坏块?出现U盘坏块U盘就不能用了吗?扩容盘和U盘坏块有什么关系?下面小编就解答一下。

　　U盘等出现的坏块，磁盘或硬盘的坏道其实都是一种物理存储介质的物理结构的损坏导致的现象，因为传统的机械磁盘的记录方式是一旋转地磁轨工作的，而U盘是使用一种叫P/N结构的单元存储数据的。因此才叫做“坏道”“坏块”其实是一个道理，就是无法保存数据了。

　　好比一张白纸上扣掉了中间一块，这样被扣掉的部分就没法在写字了一样的道理。

　　但是不一定是出现了这类的现象U盘或者硬盘就不能使用了，因为我们可以用程序屏蔽掉损坏的区域，继续使用其他的正常的区域。但是这样也就会导致容量的减少。不少的奸商利用这个技术，收购已经损坏了的U盘或者硬盘，用软件屏蔽掉坏块或者坏道后，在用其他的工具软件修改参数后卖给消费者，消费者基本无法第一时间识别到这种假冒伪劣商品，基本发现的时候商家已经搬了或者问题根本就没法找到赔偿。

　　扩容盘就是这样的一种商品。还有一种特殊的扩容盘，就是U盘本身是新的小容量U盘，使用量产工具直接刷成大的。当然这种"大"只是显示上是大的，实际可存储的数据是没有改变的。U盘工作在一种叫做"looped"的工作模式下，英文是“打转”的意思， 就是当用户拷贝大文件的时候，如果空间被占用完就自动擦除前面的空间继续拷贝!

　　最好且简单快速的检验方法就是使用超大的文件一次性拷贝，看看数据是否完整。比如8GB的U盘，拷贝6GB的超大电影文件，看看电影文件是否被正常存储。

　　所以说，大家不要看到U盘坏块就害怕，出现了U盘坏块我们不用抛弃U盘，依然可以继续使用。此前小编还介绍过如何修复U盘坏块，如果你有需要，可以看看《快速修复U盘坏块的方法》这篇教程。

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