If the write caching was set to ON, on both machines you would probably get the same results.
What does filemon from sysinternals show http://www.sysinternals.com/ntw2k/source/filemon.shtml

>>Do you have write caching disabled on the hardrive.
>>Also clear out your windows temp directory.
>
>As I was able to simulate that bug on a Win2K sever, I can only attribute this to a bug in the VFP engine in regards to what is being executed. So, I will skip that test for troubleshooting.