This hard drive (120 GB) fulfills its role passed the test installation ....... yes because if like me you are a "nozzle" in yourself and what is more a "triple nozzle" computer , you end up with this little box asking you how to introduce it without pain in the tower of your computer! Because look no installation instructions, the object comes alone, you're doing! So I preferred to call someone competent in the matter. And here we must admit that once installed, the hard drive works perfectly. My computer has become faster, works in silence, brief total satisfaction.