WD Blue SSHD 4TB  Desktop Hard Disk Drive -  SATA 6 Gb/s 64MB Cache 3.5 Inch  - WD40E31X 8 GB of NAND flash for blazing SSD-like performance Up to 5x faster than traditional 5400 rpm HDDs Designed for power PC users, creative professionals, gamers and system builders 3-year manufacturer limited warranty Package includes a hard drive only - no screws, cables, manuals included. Please purchase mounting hardware and cables separately if necessary.