Summary: I bought 17 units. They sent me a wrong part number: ST9500420AS instead of ST9500423AS. The ST9500420AS is an old model with diferente specifications. I was charged with US$ 5.95 for the shpping for every hard disk and I expected for a great package. I received the 17 units in a box almost without wrappers!
Summary: Replaced a drive on my son's HP laptop. First one had issues but called up the vendor and they shipped one over immediately. But of hassle spending so much time loading everything only to find the drive is bad. Got the new one loaded the os and all the software and has been working fine since.