Can I write to hard disk at 1 Gbps?
c++
Solution
The standard library functions for writing on files just manage their own internal buffers. When writing on files in a modern operating system, even after the `fclose` the data actually just goes in the buffers of the operating system, which will delay the write until it thinks it's a good moment.
The usual way to ensure the data is written to disk is to issue an operating-system specific call to force a write to disk; on POSIX it's `fsync`/`sync`, on Windows you want `FlushFileBuffers`.
Problem
I am a bit surprised with the disk speeds that I am getting ..I seem to be able to write a 1GB file under 1 sec.. ``` size_t s = 1*1024*1024; char* c = new char[s]; FILE* fx = fopen("D:\\test.mine", "wb"); //ensure(fx); for(int i = 0; i < 1024; ++i) { fwrite(c,1,s,fx); } fclose(fx); delete[] c; ``` I am a bit hardpressed to understand what could have caused this? I thought fclose ensured that the data is actually written on the hard disk...?