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。
Thus, when the data for each case or unit of analysis is stored in a single physical record, the file structure is called "logical record length."
所以当每笔数据或是每一分析单位被储存在一笔实体记录时这种档案结构就称为”逻辑记录长度”。
Thus, when the data for each case or unit of analysis is stored in a single physical record, the file structure is called "logical record length."
所以当每笔数据或是每一分析单位被储存在一笔实体记录时这种档案结构就称为”逻辑记录长度”。
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