I got a new 1tb WD internal hard drive and I took it out of the box and popped it right into my macbook pro 15". It fits and i am able to easily close the back on the computer. My only problem is that when i start up the computer, it loads for a few minutes, but 100% of the time after about 3-4 minutes i get a notice saying i did not eject the drive safely and all that. After that the internal hard drive is no longer there. I cant see it in my finder, or disk utility. BTW i am booting from my old hard drive externally. Is there something simple i am missing here that would cause the new internal hard drive to eject itself?