The computer has four drives installed, two drives (bays 1 and 2) have Yosemite OSX installed, and the other two drives (bays 3 and 4) currently have physical drives that have not been initialized or partitioned just yet. The drive in Bay 1 boots automatically as the default drive, but I don't currently have startup access to the drive in Bay 2. When set up, I should be able to restart the computer, hold down the Option key on the Apple Keyboard, and both drives should be presented as two bootable options. That's what I trying to do right now.