Some file systems are much faster than others, but performance varies from task to task.

一些文件系统比其他文件系统快得多，但是性能因任务而异。

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Some file systems support advanced security features, such as access control lists (ACLs).

某些文件系统支持高级的安全特性，比如访问控制列表(acl)。

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And, wonder of wonders: this gives exact block offsets and sizes for some file systems to look at.

奇怪的是：这为文件系统提供了精确的块偏移量和大小。

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