USB thinks it is drive D

Thanks to Ahmed Masoud for the link. Unfortunately this did not solve the problem, but I have managed a work around. I have assigned Drive D to my external hard drive used for back ups and this is remembered each time I plug it in and works as it should. I have assigned Drive E to my Garmin Watch - this is also remembered and I can do what I need to do - updating and charging, but now I have to open Garmin Express manually and it does show that my golf watch is connected. Both these devices used to be plug and play without having a drive assigned but when I plugged in the disk drive is when the change occurred. Any way it's now working, not exactly as it should, but acceptable. Thanks for viewing my problem.