Installation Issue with new My Passport External Storage Dev

Bought a new Win10 and am trying to install a new 2TB My Passport as a Backup device. During installation I noticed two (2) E: partitions with previous Win 8 Passport installations. I thought my new 2TB Passport would overwrite the previously installed Win 8 devices, but I am unable to get the 2TB device loaded. I am hesitant to erase the existing Win 8 E partitions for fear causing Directory issues etc. What advise do you have??? Thanks.

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