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When CreateFile Function is called without the flag FILE_FLAG_NO_BUFFERING,
what is the size of the inner buffer of operating system?
If my buffer size is larger than the inner buffer of Windows, can I
fully use up the throughput of disk?
It likely varies from windows version to windows version, as well as depending on the amount of free RAM. Rather than relying on anything specific, you should simply do reads and writes with buffer sizes that work well for your application.