I purchased this to replace a Dell Hard Drive, and this works perfectly. The drive does not make any noise as someone else had said, there is no excessive heat (that I can tell of atleast), and the overall performance is good.This is a 5400rpm drive, which is standard for most laptops. No lag times, or hour glasses when moving files, and on larger files (100MB+) the wait time is fairly decent.This only downside that I can find to this dirve, is it does not come in any retail packaging, just a brown box, bubble wrap, and an anti-stat bag. This is not a problem, to me atleast, because the drive itself is all I am looking at. Not to mention the huge discount buying OEM/direct provides. I would highly recommend it to anyone.