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I am using a 2nd internal drive with an optical bay caddy. However, whenever I use the 2nd drive it will randomly eject itself after maybe 5-10 minutes of use. This drive only does this internally and works perfectly externally. I have tried other drives in the same slot and they all work fine. The drive also works fine in the normal hard drive slot. I am tired of having this issue and have yet to find a solution. Do I need to replace the drive? It is still under warranty as I got it yesterday. Any help would be appreciated. MacBook Pro 13" Mid-2012 (MacBookPro 9,2)

This is a “known issue” when the optibay drive is not the boot drive. Think about it. You are sucking a lot of power running two HDs and your Energy Saver is trying to adjust for that. You can change the Energy Saver settings… but that will shorten battery life. Using an SSD would draw less energy also. If this Answer is helpful please remember to return and mark it Accepted.

Hi. Did you find a solution to it. I tried to turn down the sleep time to 5 minutes, but yet the disk ejects itself. It never happened before. Please let me know if you have fixed it and how? Cheers

I had the very same problem for MONTHS and it was driving me crazy. MacBook 15" Early 2011, 512MB SSD + 2TB HDD instead of the optical drive. The HDD kept ejecting randomly, requiring switching the MacBook completely off and back on. I thought it’s a faulty drive, cables, or another piece of hardware. I even thought of buying a new MacBook. Then I googled out a solution: try swapping the two internal drives… Now I have the startup SSD in place of the original DVD drive and my classic 2TB HDD in place of the original HDD. No random eject since then, for 2 weeks or so, already. Can’t find the original solution, but the explanation had something to do with SATA 2 vs SATA 3, etc. So I am trying to pass this solution to others that came across the same problem. P.S. you don’t need to change any settings, your system will boot just fine after swapping the two drives.

ok I recently update my hdd to an ssd. Hdd was working fine as the main drive then when i switched SSD as the main drive it started to boot it out. This thread helped me out from spending lots of money thank you. I bought a new MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable & replaced the old one & voila, no more problem. So far it’s been an hour & still running.