Is multithreading necessary with QFile.copy()?

Question

Qt

Good afternoon!
We need to write a program that will copy files from one directory to another (with a lot of nested sub-directories). The total volume is ~10 GB.
Does it make sense to do all this in multiple threads? Will there be a speed gain? After all, as far as I understand, here the bottleneck is a hard drive, and there, nothing will change much from the streams.
Or am I still wrong?