Western Digital WD10PURX-64E5EY0 SATA/64 MB cache purple surveillance hard drive 1 TB, 3.5 inch, buffer to host data transfer rate (max): 6 GB/s, host to/from drive (sustained) data transfer rate (max): 110 MB/s, read/write average power: 3.3W, idle average power: 2.9W, standby and sleep average power: 0.4W, dimensions (HxLxW) mm: 26.1 x 147 x 101.6 (new but the box is open)