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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For example, LogFS maintains a tree structure on the flash device itself so that the mount times are similar to traditional file systems, such as ext2.
This paper presents the storage device sector location and FAT document structure. Then it introduces how to design the FAT file management system in embedded system.