Had that same issue when I installed the OS when I got my Raid set up. Didn't really effect anything having Windows installed on drive H, but I know what you mean when you say it bugged you. I sat through another full installation just to have it on C again!
Side note: When I pulled the other drives out and re-installed windows, it went fine. But as soon as I plugged the other drives back in, Windows gave me a message that said it couldn't boot. So, I had to change boot order in BIOS to disable all other boot options except SATA. Simply setting it to boot from SATA first didn't help. Then I was able to boot into Windows and delete all the old boot files from the other drives. Once I did that, I was able to re-enable the other boot options in BIOS. Weird.