One of the factors that contribute to lag creeping up in your Android smartphone is the fragmentation of NAND data storage chips. Because of the way they work, NAND chips store data differently than other storage mediums, such as hard drives, do.
When one deletes a file, the chip doesn’t outright delete the information, but merely marks the sectors that file occupied as “not in use” and available for overwriting with new data. Both the data and the file system entry stay there, which means that, as you go on writing and deleting files, the file map grows increasingly bigger and the controller …
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