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Why does my 2nd hard drive keep ejecting randomly?

I have a quad core i7 17" MacBook Pro and I recently used the OWC Data Doubler to upgrade the optical drive to a secondary hard drive.

I used a 2TB Samsund HDD as the secondary, as I wanted to used it for storage, while using my SSD to boot and run my applications from.

My MacBook Pro recognized it just fine immediately after installation, however randomly I will receive a notification "Disk not ejected properly" and my 2nd hard drive will be gone. When I reboot, it returns until it does it again. Sometimes it will go days without doing it, other times it will do it 15 minutes apart. Any suggestions?

I am running Yosemite and have not been able to find any solution.

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I am having the same exact problem. First I had a Samsung SSD with a 400GB secondary drive and everything was working perfectly. Then I upgraded the 400GB drive to 2TB and now it just keeps ejecting on it's on. I've also tried to switch back to the 400GB drive assuming the 2TB drive is at fault but was still getting the same problem.

I am now looking into the possibility that the SATA firmware needs to be updated. I will get back to you when/if I solve this

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I remember trying to use a 1Tb in my Early 2010 and Late 2011 MBP 17's and found the systems won't read it consistently. I imagine the 2Tb is the same problem. I ended up with 750Gb's SSD's in both as secondary's, with 1Tb system drives that are partitioned 250Gb for Windows. I run a 4Tb Lacie rugged Mini off firewire for FinalCut Pro video editing and I still use them EVRY day in a design/production capacity. I also air travel 2-3 times a week, so these things are abused.

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Not sure if you have found a work-around, but I had the same issue as you. Finally, I tried to put the SSD in the data doubler and the 2TB drive in the main drive bay. Voila, it worked. Not sure why, but now no problems.

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Hi Matthew,

I too had this problem. I found a solution in this youtube video. Please check it out. It might solve your issue.

https://www.youtube.com/watch?v=ASV9X8ef...

By following steps in this video , the random eject issue of 2nd HDD was solved on my Macbook Pro.

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