This paper introduces some existing hard disk protection technologies , analyzes their functions and compares their good and bad sides . it also discusses the principles of all kinds of the protection technologies 本文介紹了現(xiàn)有的幾種硬盤保護技術(shù),分析比較其功能及優(yōu)缺點,并探討了各種保護技術(shù)的原理。