HGST， a Western Digital Company ULTRASTAR 7K6000 4000GB 7200RPM SATA 512E ULTRA ISE 128MB Cache 3.5-Inch Internal Bare or OEM Drives 0F23005<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Best-in-class random &amp; sequential performance</li><li>Reliable， field-proven， 7th generation 5-disk design</li><li>12Gb/s SAS and 6Gb/s SATA for compatibility with high performance data centers</li><li>128MB cache buffer improves response time and data management</li><li>2M hours MTBF rating &amp; 5yr limited warranty</li></ul></div><img src="http://ecx.images-amazon.com/images/I/515y468JT7L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/417QcwE6HYL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51LqDUeFnBL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/517XVQoNK4L.jpg" noproxy>