320GB SATA Hard Drive (5400 RPM) for Dell Inspiron 1428 1440 1464 Laptop Capacity: 320GB 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)