HGST Travelstar Z5K500 internal laptop hard drives 2.5 "SATA II 5400 rev / min 8 MB Cache 500 GB (Personal Computers)
Hitachi is quite a good brand in terms of hard disc. In general, it's solid. For the price, this is more than enough to make the backup. I bought it for this main use elsewhere. Of course I would have preferred a speed of 7200 rev / min rather than 5