The data recovery of hard disk software failure can be solved by the following ways, the recovery of main boot partition, partition table, DBR, zero track and the file deleted by mistakes.
硬盘软故障的数据恢复主要可以从以下几个方面入手：主引导区恢复、分区表恢复、DBR修复零磁道损坏的修复以及文件误删除的数据恢复。
The situation of zero-failure data may occur in the reliability life test of an electronic product when it has a high quality or the test time and fund are limited.
在电子产品的可靠性寿命试验中，如果产品本身的质量很好，或者受试验时间和费用等条件的限制，则有可能出现“无失效数据”的情况。
Incremental optical electric axial Angle encoder usually adopts zero position grating providing absolute zero position in order to prevent from data fault during electricity failure suddenly.
为了防止突然断电时造成数据错误，增量式光电轴角编码器通常采用零位光栅提供绝对零位信号。
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