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.

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.

This system consists of three main parts, data collection, frequent measurement and data showing. The design basign bases on the principle of precision, economization, security and reliability.