Companies Web site Comments Headway Technologies, Inc (USA) http://www.headway.com/ subsidiary of TDK Hitachi Global Storage Technologies (USA) http://www.hitachigst.com Seagate Technology Inc. (USA) http://www.seagate.com/ TDK Corporation (Japan) http://www.tdk.co.jp/ Western Digital Corp. (USA) http://www.westerndigital.com/