the p>FAT file system was not complicated considering the limited efficiency of computers at that time, so it was supported by almost all personal computer operating systems. This feature makes it an ideal floppy disk and memory card file system, and is also suitable for data exchange in different operating systems.
but FAT has a serious disadvantage: when files are deleted and new data is written in the same location, their fragments are usually scattered, which slows down the reading and writing speed. Disk defragmentation is a solution, but it must be reorganized frequently to keep the efficiency of FAT file system.
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