I do not get that window with the GUID option after clicking the erase button. I googled my problem and apparently, others have had this problem with external HDs.

Any ideas anyone? I'm thinking perhaps Lacie/ Seagate can help me.

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