Here's common FAQ for raid..Do some readinghttp://www.tomshardware.com/forum/259807-32-raid
You need to create your raid/paritioned for the different OS you need
Options to select which OS to run
1) Linux have built in OS manager that select which OS to run. I don't use and recommend this.
2) Use OS manager (i.e. Acronis) to select which OS to run at BOOT Time. This is what i use (Linux, Windows)