A lot of Toshiba have proprietary firmware installed on the hard drive. You will not be able to change it unless you buy the drive from Toshiba. Also a lot of Toshiba's refuse to load windows software, unless it's the proprietary Toshiba / microsoft version.
Hardware software on laptops is not standardized, although some manufacturers are slowly adapting standards. Some manufacturers follow standards, Toshiba I'm not so sure about.
Of course, it's designed to prevent you from fixing it, unless you shell out the cash.