Toshiba HDDs in this website are shipped to OEM customers as storage devices installed in OEM PC systems. Please ask the PC manufacturer what kind of HDD will operate properly in the system. Consulting the PC manufacturer is recommended.
In addition to the physical dimensions and connectors, there are a lot of parameters (like power consumption, temperature distribution, etc.) that could differ. Also, older BIOS versions may have difficulties recognizing modern HDDs which exceed a certain storage capacity. So please contact your PC manufacturer or certified dealer for information on which HDDs can be used in your PC.