Seagate continued to sell hard drives to Huawei despite tightened export controls imposed on Huawei in 2020, the Commerce Department said. Photo: Justin Sullivan/Getty Images Two subsidiaries of Seagate Technology Holdings PLC have agreed to pay $300 million for violating export restrictions placed on Huawei Technologies Co. over fears the Chinese telecommunications company poses a threat to U.S. national security. The Dublin-based data-storage equipment provider continued to sell hard drives to Huawei despite tightened export controls imposed on the Chinese firm in 2020, the U.S. Commerce Department said Wednesday. U.S. officials for years have voiced concerns that Huawei’s equipment could...