The structure and size of a file depends on the underlying file system—the subsystem that persists the file data to a physical device.
文件的结构和大小取决于底层文件系统 — 即把文件数据存储到物理设备上的子系统。
If the file system data structures happen to align perfectly with the underlying physical partition size, a read or write of a 4096-byte data structure results in a read or write of a single sector.
如果文件系统数据结构正好与底层物理分区大小一致，对4096字节数据结构的读写会产生对单一扇区的读写。
A Hierarchical file can be stored in a rectangular file structure by storing all units of analysis in a single physical record.
而一个层级式档案可以用长方形档案结构储存，亦即所有的分析单位都存到单一笔的实体记录中。
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