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.
幸运的是，Lucene的类IndexWriter提供了三个参数用来调整缓冲区的大小以及往磁盘上写索引文件的频率。
Fortunately, Lucene's IndexWriter class exposes three parameters to let you adjust the size of the buffer and the frequency of the disk writes.
由于文件数据和stat _ data(索引节)信息是紧挨着存储的，它们通常能被同一次磁盘IO操作所读取。
Since the file data and the stat_data (inode) information are stored right next to each other, they can normally be read with a single disk IO operation.
因此，可以用相对记录号加上文件起始地址的方法算出任意一个记录的物理位置。（记住：文件的起始地址是当文件被打开时，从磁盘的索引中得到了）。
The Number property indicates the physical slot number, which can be used as an index into a system slot table, whether or not that slot is physically occupied.
因此，可以用相对记录号加上文件起始地址的方法算出任意一个记录的物理位置。（记住：文件的起始地址是当文件被打开时，从磁盘的索引中得到了）。
The Number property indicates the physical slot number, which can be used as an index into a system slot table, whether or not that slot is physically occupied.
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