HP 18.2GB 3.5" 10K Ultra3 SCSI. Hard drive capacity: 18.2 GB, Hard drive size: 88.9 mm (3.5 "), Hard drive rotational speed: 10000 RPM. Weight: 590 g. Operating temperature range (T-T): 5 - 60 °C, Operating relative humidity range: 5 - 95 %