Will writing to zero undue all updates?

WD External Drives External Drives for PC
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I installed a new internal drive.  I went from a 500GB WD Caviar Blue to a 1TB Caviar Black.    The windows 7 is installed on the new internal drive.

I want to wipe the external and get rid of that …  smartware for good.    Wouldn’t wiping that clean get rid of everything??   Why would it keep the firmware update??