Toshiba Satellite L755-S5156 (PSK1WU-0XT048) 500GB SATA 5400RPM 2.5in 7mm Laptop Hard Drive Replacement Size: 2.5", 7mm height Speed: 5400RPM, 12ms seek Interface: Serial ATA 2.6/ATA-8 Transfer Rate: Up to 3.0GB/sec