ExcelStor: http://www.excelstor.com/eng/support.php?sub_id=3
Hitachi/IBM: http://www.hitachigst.com/support/downloads/
Samsung: http://www.samsung.com/global/business/hdd/support/downloads/support_in_es.html
Toshiba Fujitsu: http://sdd.toshiba.com/main.aspx?Path=SoftwareUtilities#diagnostic
Seagate, Maxtor & Quantum:http://www.seagate.com/www/en-us/support/downloads
Western Digital:http://support.wdc.com/product/download.asp?lang=en