OS 10.12.6

Today I purchased a 2 TB Lacie HD which requires 10.11 I registered it with Seagate and thought I would partition it into 2 equal parts. When I open D/U, the partition is greyed out.

I then opened my back-up #1 HD, they are both in the D/U sidebar but only # 1 is not greyed out. Help please.

jaybass


OS 13.6.6 iMac (Retina 5K, 27", 2017, 3.4 GHz Intel Core i5, 24 GB RAM, 2400 MHz DDR4. SuperDuper. 1 TB Lacie HD