What's the fastest C function for writing binary data to disk?

I'm acquiring data at high speeds across multiple boards and I'm having a hard time writing the data to disk fast enough to keep up. I'm programming in C in Visual Studios and I'm currently using fwrite. I have a similar system set up in LabView and my C code can't perform as well. Is there a better or faster way to write to disk in C?

Some speculated a few years ago that there would be
no reason to use Fortran too. :)Are you saying there's a reason to use Fortran? Help me lord!
Anyway, they were right! The industry may be stalling, but the vision is not. The economy and many other factors are to blame for why we haven't been able to break out of the computing paradigm we're stuck in. It's like the automobile, it hasn't changed in a century. Why? $$$
Oh, people said we'd have flying cars by now, where are they? Well we do have them! But we're too busy spending that 400 billion a year on war instead of evolving as a species.
Anyway, when we take the next step and have true distributed computing with multi-core processors everywhere, Java will run, Java will scale, and Java will outperform ANYTHING available.
And speaking of game programming, the PS3 developers are having a hell of a time doing the 3 CPUs. Why? Because all they've ever done is single & double processor systems. It's time to think out of the box. When a game console hits the market with 512 CPU cores, do you REALLY think C/C++ will run on that? But, Java was designed for it.
Java = the future
C++ = the past

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