Disk Partition is disabled for newly format disk I am using macOS High Sierra.

I erased my 1 TB disk using disk utility to using Mac OS Extended (Journaled) file system.

I want to perform partition on my disk and want to split into two parts, i.e. 500 GB both.

But I am unable to do it as partition symbol is disabled in disk utility.



Any help would be appreciated. Thank you.
The command below assumes the external drive is still disk3, as shown in the OP's image.

diskutil  partitionDisk  disk3  2  GPT  JHFS+  Seagate1  500G  JHFS+  Seagate2  R


This command will erase the entire contents of the external drive.