打开写入磁盘的文件并检查它包含的数据（参见图 21）。

Open the file that was written to disk and examine the data it contains (see figure 21).

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许多比较老的文件系统缺少日志，这常常意味着在系统崩溃之后需要长时间的磁盘检查。

Many older file systems lack journals, which often means that they require lengthy disk checks after a system crash.

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它通常用于检查和评估文件在磁盘中的放置效率。

It is commonly used to examine and assess the efficiency of a file's placement on disk.

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