right click it when it appears. When the application applet appears choose "boot" tab then choose the drive you want by clicking on it and then press the "set as default" button. Then restart your computer.
Hope this helps.
I have two hard drives inside my tower and I was just wondering how I can switch the main drive to be the secondary drive. My secondary drive used to be the main one. I went in to check my connections one day and when I turned my computer on after that the secondary drive was now the main drive and the other drive was not even there. It revived my computer back to January 6th, 2007. So I just wanted to know how I can switch back the main drive to be the secondary drive and vise versa.