3.5"4 TB64 MB7200 rpm768 MBps (6 Gbps)WD® a long-time leader in hard drive technology designs and manufactures the #1 selling internal and external hard drives and award-winning media players and network drivesHard DriveInternalSATASATA/600WDWD4000F9YZWD4000F9YZ Hard DriveWestern Digital Corporationhttp://www.wdc.com