Partition external HD


(solved) purchased lacie rugged usb-c 2 tb external hd use 2017 mbp, i'm new mac world. want partition , when erase partition button greyed out. i'm on high sierra. format used macos extended journaled didn't give me option erase new afs format. doing wrong or because drive isn't ssd? appreciated.
 

is mac in guid partition map scheme? if not, can problem. had format internal drive because mbr , not guid. hope helps. cheers.
 


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