Resolved Second drive not showing in Win 10

I have just upgraded my main computer from Win 7 to Win 10 but I cannot see my second SSD drive in explorer the funny thing is that programs can see the drive and access it but I cant, I have gone into disk management and it is there, I have changed the drive letter as some sites advise but it still is not recognised, even Samsung magician can see the drive but I cannot see it in explorer only my main drive any help would be welcome

 

The drive has suddenly appeared in explorer after plugging in and external USB drive so problem solved hopefully

 

Except that does not really make sense. Is the drive still there if you unplug the external drive?

 

Yes it is now permantely visible in explorer as it used to be in win7 even when the usb drive is removed

 

Well, that's good - though I cannot explain what happened. I can only guess it maybe had something to do with conflicting drive letters - as happens some times with removable drives.