I switched out my old 250 GB hard drive that shipped with my MacBook Pro for a new 640 GB WesternDigit drive. I'm trying to use a Mavericks installer USB to install on my newly formatted hard drive, but it's taking way too long - I mean, I left it going overnight (about 7.5 hours), and when I came down, it wasn't even half done. Is there anything I can do here? I'd like to use my laptop. Thank you very much for any suggestions.