File explorer only displays my C and D (DVD) drives when launched. I have two other hard drives with two partitions each which do not get displayed under 'This PC'. I landed up 'pinning' the drive letters under 'Quick access'. I spent a lot of time hunting for a solution without any luck. For the time being, my discovery of pinning the drive letters under will have to do, however I would feel a lot better if I see the drives listed under 'This PC".