这个小工具可以比较安全的删除文件和目录。它删除文件的流程是：

1. 使用伪随机数填充整个文件

2. 将文件长度截为零

3. 将文件命名为随机字符串

4. 删除文件

需要指出的是，这样的删除在软件级别已经是不可能恢复了。但是特别重要的数据（军事级别？）是不允许这么简单的操作的，据某个标准称为了在特殊的硬件设备下都无法恢复硬盘数据，至少应该把文件区域写7遍，更安全的办法是把磁盘物理销毁（例如粉碎）。

-This gadget can be relatively safe to delete files and directories. It delete files process are: 1. The use of pseudo-random number filled the entire document 2. Will cut the length of documents to zero 3. Will file naming random string 4. Delete the file needs to be pointed out is that this deletion is already in the software level can not be restored. However, a particularly important data (the military level?) Is not to allow such a simple operation, according to a standard known as the special hardware devices can not be restored under the hard disk data, it should at least write the document region 7 times more secure approach is to destroy the physical disk (for example, to crush).