I would not buy a Kingston drive. They are not known for their reliability. Sandisk Ultra II 480gb, or a samsung 850 evo 500gb, would be a better choice. Once you are done with the OS swap, you can wipe out the old C: partition, and extend the old D:, or format the old C and keep two separate partitions. Windows will establish the SSD as C:, and change the letters on your 1tb. Make sure which partition is which, before you format.