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How can I find hard disk speed? I can not use System.IO.File.Copy and use timer to get hard disk speed, because after caching file, the speed will be really higher than real time.
What can I do instead?
The reason the subsequent read speed is much higher than expected after writing a file, is that the file is cached by the OS in the disk system cache when it is written i.e. in-memory. The subsequent file read is in effect being read from memory, rather than disk.
Please see this code project article which provides a solution for bypassing the OS disk cache by leveraging the FILE_FLAG_NO_BUFFERING flag:
http://www.codeproject.com/KB/files/unbuffered.aspx
This solution can be used in your context to avoid OS disk caching, and so obtain “real” disk speeds.