

It is both inefficient and potentially harmful : the mechanical stress is considerably higher when the heads are moving repeatedly across the platters to reach several areas in short succession, rather than staying at the same spot to parse a large contiguous file. Multithreading is typically not efficient when it comes to copying files from 1 storage device to 1 other, because the fastest throughput is reached for sequential reads, and using multiple threads will make a HDD rattle and grind like crazy to read or write several files at the same time, and since a HDD can only access one file at a time it must read or write one chunk from a file then move to a chunk from another file located in a different area, which slows down the process considerably (I don't know how a SSD would behave in such a case).

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