IBM 1TB 2.5" 7.2K NL SATA 6Gb/s Slim-HS. Hard drive capacity: 1000 GB, Hard drive size: 63.5 mm (2.5 "), Hard drive rotational speed: 7200 RPM. Operating temperature range (T-T): 5 - 60 °C, Storage temperature range (T-T): -20 - 60 °C, Operating relative humidity range: 10 - 90 %