Thunderbolt port problems with Hard drive

Hello guys, since I updated to Yosemite 10.10.2 I have a problem with port thunderbolt, to which I have connected a hard disk. When I turn off the hard disk with its button after pressing "eject", the hard disk turns off but also restarts the MAC. I tried to connect it to the USB3 and it works ok. This problem I had never experienced with the previous operating system. Some of you can help me? Thank you very much!!!! ;-)

I had problems with my hard drive and was able to replace it myself. I am not technical at all but was still able to do it. Go on line and you will find some sites on how to do this they are very good. It did not take long and I am using the Powerbook to respond to your thread. Good luck.

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