The difference between IDE and SATA is the style of connection between the HDD and the motherboard. The OS that was installed on it will make little difference because it's the type of plug on the back of the HDD itself... not what's on it. The quickest way to tell is look at the back of the HDD. Does it look like the picture? If it does, then it is IDE and might not work with the blacX duet docking station unless you found one with an IDE interface.
Assuming the docking station matches the plugs on the back of the HDD, you should just be able to plug the docking station into a USB and have it show up as an external storage device.