数据块（datablocks)和磁盘块(disk blocks)是映射的关系。
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How can I specify erasure patterns when erasing disk blocks?
擦除磁盘块时如何指定擦除模式？
Later, the RM will update the actual disk blocks corresponding to the changed data.
之后，RM将根据所更改的数据更新实际的磁盘块。
Fragmentation is the phenomena that as files are created and extended they use up blocks of the disk.
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