当我们把文件从一个位置复制到另一个位置时，我们绝大多数人从不考虑在后台发生的事情，我们只是简单地完成任务并继续前进。但有没有留下一份我们不知道的副本？有鉴于此，今天的超级用户问答帖子回答了一位好奇读者的问题。

今天的问答环节是由SuperUser提供的，SuperUser是Stack Exchange的一个分支，是一个由社区驱动的问答网站分组。

由Arik（Flickr）提供的屏幕截图。

问题

超级用户阅读器BattlFrog想知道在两个USB闪存驱动器之间复制文件时，Windows缓存是否保留副本：

I plugged two USB flash drives into my Windows 7 laptop and copied a file straight from one flash drive to the other. Would my laptop’s operating system also have a copy of that file on it somewhere by chance?

在两个USB闪存驱动器之间复制文件时，Windows缓存是否保留副本？

答案

超级用户贡献者EEAA和Abraxas为我们提供了答案。首先，EEAA：

No, it would not. Parts of the file may be cached in memory, but extracting those parts and sorting out which parts are missing would be either incredibly difficult or impossible.

接下来是艾布拉克斯的回答：

I think it should go without saying, but it is perhaps worth noting that even if parts of those files are in memory, they will not stay there permanently. Things like rebooting the computer or having a high utilization of memory occurring will cause those pieces to disappear relatively quickly.

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