WD Blue WD40E31X - hybrid hard drive - 4 TB - SATA 6Gb/s

WD Blue Solid State Hybrid Drives (SSHD) combine a generous amount of NAND flash SSD technology and massive HDD storage capacity into a single drive. WD engineers team up the best of SSD and HDD to produce a hybrid that can increase overall system performance - resulting in quicker system boots, faster application loads, and improved responsiveness when compared to traditional hard drives.