Summary: The computer I bought this for had an Apple hard drive. I'm no expert on computers, but it seems to me there would be compatibility issues after a short period of time. And there were! That 250 GB HDD crashed before I had it for one full year. Now I have this hard drive and it seems to be working out very well. If I need another one I know where to get it. And who knows. Maybe I'll be able to fix my other laptop.