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。
I will use the letters as reference for the different sorts of challenges, but first we need to understand Point s.
我用字母来代表不同类型的挑战但是我们首先应该明白S点。
This article lays its key point in analyzing the advantage and defect of blog, providing some reference for education blog s application to teaching.
本文的重点在于分析了教育博客的优势与缺陷，为教育博客应用于教学提供了参考。
This article lays its key point in analyzing the advantage and defect of blog, providing some reference for education blog s application to teaching.
本文的重点在于分析了教育博客的优势与缺陷，为教育博客应用于教学提供了参考。
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