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Windows never does well with external drives. It wants to change drive letters based on what jack/controller it's plugged into....
You need to assign it a letter. This might be happening because you've done something in a past OS install and upgraded where you assigned every external drive to D: or some low letter. If there's a D: already mounted and you plug it in--it won't show in Explorer until you "fix that" in Disk Management.
But, if you will plug in each of your drives, either all at the same time or individually and assign them say L, M, N, O, P (with the assumption that you haven't used those letters already) in disk management---then it should continue to mount them to their respective drive letter no matter what port you plug it into.
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