Hard drive performance decreases when multiple partitions, on the same drive, are accessed simultaneously. This is exactly what will happen if you try to run your operating system and FSX from seperate partitions.
With only one hard drive, your best performance WILL be achieved with your OS, FSX and your page file all on the same partition. It doesn't matter how many partitions you have set up, this is still true.
You have been given very good advice. It's up to you to take it or leave it. I wouldn't expect anyone to waste too much time trying to convince you though.
There are good reasons for having multiple partitions on the same drive, but improving performance isn't one of them.
See ya, Milt
If it ain't broke..., fix it any damn way!!!