Detail overview General Information: Brand : Western Digital Model: HUS724040ALS640 Product Line : Ultrastar Product Series : 7k4000 Product Name : Ultrastar 7k4000 HUS724040ALS640 Hard Drive Key Features : Storage Capacity : 4 Tb Interface : Sas-6gbps Drive Dimensions : 3.5 Inch Areal Density (maximum) : 475 Gbits/sq. In. Load/unload Cycles (at 40° C) : 600000 Mtbf : 2 Million Hours Performance : Average Seek Time : 8.0 Ms Rotational Speed : 7200 Rpm Buffer : 64 Mb Interface Transfer Rate (maximum) : 600 Mbps Sustained Transfer Rate (typical) : 172 Mbps Physical Size : Z-height : 26 Mm Dimensions (width X Depth) : 101.6 (+/-0.25) X 147 Mm Weight (typical) : 690 G Environmental (operating) : Ambient Temperature : 5º To 60º C Shock (half-sine Wave 2 Ms, G) : 70 Vibration, Random (g Rms 5 To 500 Hz) : 0.67 (xyz) Environmental (non-operating) : Ambient Temperature : -40º To 70º C Shock (half-sine Wave 1ms, G) : 300 Condition : Refurbished. Availability : In Stock. Our Warranty : 30 Days.