静态文件、模板和代码都来自磁盘，组成数据库的数据表和索引也来自磁盘。
Static files, templates, and code are served from disk, as are the data tables and indexes that make up the database.
它是处理磁盘上的文件系统的基础，因为它定义文件系统的管理参数(例如，块的总数、空闲块和根索引节点)。
It provides the basis for dealing with the on-disk file system, as it defines the file system's managing parameters (for example, total number of blocks, free blocks, root index node).
当你需要索引大量的文件时，你会注意到索引过程的瓶颈是在往磁盘上写索引文件的过程中。
When you need to index a large number of documents, you'll notice that the bottleneck of the indexing is the process of writing the documents into the index files on the disk.
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