reading file with multi-thread

[lni]

Is it because of considering synchronizing the threads,If there are 10 files,I think it can accelerate the speed,Am I right or not?

I don't know very much about hardware, but I think hard drive has a limit on sustained transfer rate. It is like a water pipe having a fixed diameter that limits the amount of water flowing inside the pipe each second. If you turn on 10 faucets simultaneously at the end of pipe, each faucet will only get 1/10 of water, and will lose some in the middle... I don't if this explanation makes sense, hope someone may have better idea.

Check this, but I didn't read it (too much for me). You can summarize for us
http://www.pcguide.com/ref/hdd/perf/...ransSTR-c.html