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。

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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。

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After synoptically introduced the physical structure of Smart Card, the using of the chip AT89SC168 and structure on file and data of Smart Card is especially introduced.

在概括性地介绍智能卡的物理结构之后，重点介绍了AT 89sc168芯片的使用，智能卡的文件数据结构和卡内操作系统结构。

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