Partitioning with c++

I'm new to c++ and find myself working on an advanced program with sombody who knows nothing about c++. Nobody has really ever made me understand the limitations of c++, so this will probably be a stupid question. But anyways, in this program, I want to almost partition the hard drive to create a set amout of space for the program at first runtime. This would preferably be a physical division of the hard drive, but if it isn't its probably ok. If c++ cant actually partition the hard drive, is there any way to make a cache or something similar? Thank you, and sorry if it is a dumb question.

This isn't a C++ question specifically; it's a question about what the system API will allow you to do (Win32 for most people). That API is accessible from multiple languages, not just C++.