My understanding between the Blue and Black is the size of the ssd drive, i.e, 256 GB verses 1 T for example. I purchased the 1T and it is black. It works very nicely and is fast. I use the usb-c to usb-c connection between the Samsung drive and my HP laptop the has a usb-c port. The drive is sleek and small and has password encryption. I am very satisfied. The only drawback is that the 1 T drive is pricey.....but I am very glad I purchased it and would not hesitate doing it again if I need more drive capacity.