What to say at a time I was studying the sizes of trays, technology, feedback etc before buying hard disks ... I had to replace emergency I took the cheapest ... and well no They are slower, noisier and hotter than the original discs laptops in question (2 old Toshiba's certainly dead). I'll have to make images regularly I'm too lazy to run tests and take ... Avoid Western Digital. Or at worst the attempt to 7200rpm HGST model ... So I hope at least they are reliable ...