Security of data in computer system is put forward and system frame design, function design, principle and method of core modules implement are all mentioned.

提出并实现了一种数据安全管理系统，对系统的设计目标、框架设计、功能设计以及核心模块的实现原理及方法进行了详细的论述。

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I believe we understand the principle of data recovery, you can easily understand why the deletion of the use of common methods, and security can not be completely clear of data.

相信大家了解了数据恢复的原理之后，就可以很容易的理解为什么使用普通的删除方法，无法彻底和安全的清除数据了。

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