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Mid 2012 model, A1278 / 2.5 GHz i5 or 2.9 GHz i7 processor.

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double ssd in MacBook Pro 2012

Hello friends. two days ago I decided to install another SSD on my mac because I'm a dj and I work with a lot of music. ok this is the case. buy a caddy to remove the cd drive and install the new solid disk that is a samsung evo 860 of 500gb that I also have as main disk. When doing the whole process, the computer does not read the SSD that is in the CD unit. Try to install the factory HHD with the caddy and you will not read it either. What can be? my model is A1278 indentifier 9.2. I wait for your help. Thank you.

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@danj Ideas?

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Who's carrier did you use?

You are sure you have a 2012 13" MacBook Pro? Please double check.

Here are the models within your series MacBookPro9,2. Which one is yours?

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MacBook Pro (13-inch, Mid 2012)

2.5 GHz Intel Core i5

16 GB 1600 MHz DDR3

Intel HD Graphics 4000 1536 MB

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Apple has a known issue in many of their MacBook Pro’s. You see the PCH chip in some is not properly clocked so many SATA III (6.0 Gb/s) drives won’t work properly. In your case the faster i7 model won’t work whereas the i5 model will! Same exact PCH just the difference in the clocking makes the difference!

Review this OWC - Data Doubler OWC Red note is a bit confusing as the Model listing does not point to the Red note at the bottom, yet the note its self lists the MacBookPro9,2 model. Again, this is a MacBook Pro logic board issue not the carrier its self.

So if you have the i5 model you should be able to get the drive to work. If it still fails either try a second carrier in case yours is defective or not rated for SATA III (6.0 Gb/s) support or try a fixed speed SATA II (3.0 Gb/s) drive.

Sadly, while I personally love the Samsung EVO SSD’s it is a auto sense drive and won’t latch into the needed I/O SATA speed as such won’t work. OWC does make a fixed speed SSD OWC - Mercury Electra 3G SSD which is one of the few fixed speed SSD’s still on the market.

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Hi, I have the i7 version of the 13" Macbook Pro 2012. I have tried fitting a SSD in a caddy where the optical drive was, but I am getting 'error 36', and 'read only' errors. It will not mount properly or format properly.

Is this because it is the i7 model?

Is there any way I can get the SSD to work as a second SSD in the optical drive in this model?

I am using a Crucial MX500. I have also tried the WD Green SSD but also does not work.

I thought the problem was possibly the cadddy, but now it seems that my i7 version is not capatible? Is there absolutley no way to get this working? Please let me know any solutions to this.

Also: The caddy I am using is not the OWC one...

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It makes no difference who's optical drive carrier you use! You could be facing an issue from the logic board in this series. OWC was good enough to document this issue which is why i point to their unit. Locate the Model ID within the System Report from within the About This Mac menu entry. as an example MacBookPro9,1 which is a M15" MacBook Pro which I'm using right now. Then go to the Blue URL link above to check your system out.

As far as the drive you do want to reformat it with GUID partition mapping and HFS+ file system (running under macOS Sierra) or GUID with APF file system under macOS Mojave. Skip over High Sierra.

If you still can't get it to work are you able to get it to work in the HDD drive bay? You may need to replace the HD SATA cable as they often need replacing Your Hard Drive Cable Is A Ticking Time Bomb and you don't want to damage it by folding it, instead use a BIC pen ink straw which has the correct radius to help you form the arcs the cable needs at the bend point. Here's the needed part: MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable and how to install it MacBook Pro 13" Unibody Mid 2012 Hard Drive Cable Replacement

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