External Drive not able to read.

Hi All,

newbie here, I plugged my back-up external HDD into my Fujitsu Lifiebook running Windows 10 64bit Pro. and Windows is asking me to re-format it, I have not done this, any suggestions what I can do to recover my data? I am not sure if this is related but I updated 10, or rater Microsoft did and since then my built in card reader won't recognise my sd cards. The hard drive is a Samsung 1tb, USB3, I have tried another external HDD (USB2) and that is fine all other USB devices also work fine.

Thanks Chris.