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