In the Disk Utility tab, select the external hard drive that is connected to the Mac, and then click on Erase at the top.
ໃນ Disk Utility ແຖບ, ເລືອກເອົາຮາດດິດພາຍນອກທີ່ຖືກເຊື່ອມຕໍ່ກັບ Mac, ແລະຫຼັງຈາກນັ້ນໃຫ້ຄລິກໃສ່ Erase ຢູ່ທາງເທິງ.