This is an internal 2.0TB 7200RPM hard drive replacement and or upgrade for various Mac desktop models. Storage capacities up to 2TB. Perpendicular magnetic recording technology. SATA 3.0 Gb/s interface. Ramp load design increases shock. Protection and power savings. Thermal monitoring and fly height control enhance reliability. Three low-power idle modes boost power efficiency. Silent seek acoustics achieve ultra-quiet operation. Host/drive authentication for hardware security. iMacs may have incompatibilities with the temperature sensor on aftermarket hard drives which may require special software to overcome firmware issues.