数据块（datablocks)和磁盘块(disk blocks)是映射的关系。
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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。
In Listing 2, the first line shows the total number of disk blocks (52) used by the listed files.
在清单2中，第一行显示所列文件使用的磁盘块的总数(52)。
Fragmentation is the phenomena that as files are created and extended they use up blocks of the disk.
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