Time Machine on an Ext. Drive
I had time machine running on a partition of an external drive. It started to frustrate and cause of a delay of computer's starting time (it takes more than 5 minutes after entering my password) then I deleted the Time Machine from my system but now I can not mount / erase the Time Machine partition on the drive. Is there another way to erase a partition other than macOS's disk utility? so then I can reuse the same partition for a new Time Machine.
MacBook Pro 15″