Here's why this could happen: the metadata update would erase any reference to the original data block(s), but would point to data block(s) on disk that were never filled with data.
出现这种情况的原因如下：元数据更新删除了对原先数据块的任何引用，却指向磁盘上没有填充过数据的数据块。
Renewing work file with it's mirroring in hard disk and renewing its standard data reference rapidly if the encrypted mirroring in hard disk was not demolished.
若硬盘上的加密备份文件未被破坏，以该文件快速恢复被破坏的工作文件，并更新标准参照数据。
The study can be for reference in designing the products of hand tractor attached driving disk plow.
研究结果可供手扶拖拉机配套驱动式圆盘犁产品设计时参考。
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