1TB SATA Hard Drive for Alienware M15x M17x M17xR2 M17 Capacity: 1TB (1,000 GB) Form Factor: 2.5" (for Laptop Computers or Small-Form-Factor Desktop Computers) Approximate Dimensions: 9.5mm (H) x 70mm (W) x 100mm (D) Disk Speed: 5400 RPM Conection Type: SATA (Serial-ATA)