What does Disk Management tell you about the disk? That's much more important than Device Manager.
http://www.disk-partition.com/windows-10/windows-10-disk-management-0528.html tells about it. I expect it to show either a 120 GB partition, or a 66.6 GB partition with the remainder being unallocated.
I've recently used the free version of Macrium Reflect to try moving Win 10 from my internal 66.6GB SATA drive to an external 120GB drive. After replacing the 66.6 with the 120 (as a new internal HDD), Win 10 was correctly pasted onto the 120GB drive and Win runs okay on it, but Device Manager now identifies that 120GB drive as a 66.6.
How can I make Windows update the properties of the internal drive and acknowledge that the 66.6 drive has been replaced with a larger drive?