If you are simply trying to boot from D rather than C and both drives have OSs on them, you can usually change the boot device order in your system BIOS.
Alternatively...
Each drive will have a series of paired pins on the back with a jumper connecting two of them. A diagram somewhere on the drives case will indicate which pins the jumper must be connected to in order for the system to assign the master and slave. Opening the PC case may invalidate any warrenty. If you are going to tinker with the inside of your computer, make sure that it is unplugged and you are attached to some kind of anti-static pad to prevent mishaps. If you do not know what you are doing - get someone who does.
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