Id like to add that we are having the same issue building T470 laptops with windows 7x64 we use the default partitioning in the osd tool. This appears to be a issue with this model of laptops. I'm confident of this as we also build t460 450 440's with no issues in regards to card reader.
I would also mention that the card reader in our T470 range is the alcor model and not the realtek one. It would be good to have some feed back from IBM as this seams to be a general issue that needs resolving.