Type: Hard DisksHitachi Ultrastar 7K4000 HUS724040ALE640 4TB 7.2 K RPM 3.5 Inch 64MB Buffer SATA Internal Hard Drive.To visit: http://partsarcade.com/hitachi-ultrastar-7k4000-hus724040ale640-4tb-7.2k-rpm-3.5inch-64mb-buffer-sata-internal-hard-drive.-new.htmlPartsArcade is an online seller of computer system parts and devices. Partsarcade provides the finest prices on computer parts, laptop, server parts, electronics and more with complimentary shipping and top-rated customer care.