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

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both problems with dual SSD

Hello friends.

I recently managed to install two SSD’s in my 13” MacBook Pro Mid 2012.

I had problems at first, but it was all the fault of the optical drive caddy. It did not work in my system and I had to buy another. I now works super well.

I want to use the two SSD drives of 500 GB to become a RAID 0 set to make a 1 TB drive. I put them in RAID 0 and I installed the backup that I had made.

I do not know that when it installs everything that the computer makes the both I get the Apple but he does not want to bother. Does anyone know what I'm doing wrong?

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As how to setup the RAID 0 - Here’s a good reference: Use Disk Utility to Create a RAID 0 (Striped) Array. You’ll have issues with newer MacOS releases as Apple does not support RAID 0 under Sierra or High Sierra (even though their documentation states otherwise. I haven’t had a chance to see if Mojave (10.14.x) fixes the issues or not.

With Sierra and High Sierra Apple added support for a newer format structure to give SSD’s better performance - APFS. But in the process had issues with Fusion drives and RAID so these options were turned off as far as I could tell, Apple never posted any notation on RAID but did so with Fusion Drives.

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I did the whole process well from making the raid 0 to installing the majove system through the back up that I did to the machine. when joining the ssd disks the mac assistant does not let me do a clean installation of the same majove 10.14 because it tells me that I can not install that operating system in a unio Raid 0 only allows me to install the back up. After about 2 long two hours waiting for you to install the back up when the computer ends the system restarts seeing the apple and there stays as if it had no operating system. alparecer and my understanding is that mac can not start using Raid 0 with two SSD installed on the laptop.

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There maybe still a way! You'll need to boot up under an external boot drive with the OS installer present, wipe the drives down and reformat the to GUID/HFS+ (journaled) not GUID/APFS !! But you can't run the OS installer without modifying it so it does not upgrade the file system automagically! How to Skip Converting to APFS When Installing macOS High Sierra. I haven't tried it with Mojave yet but it should be the same.

Note if you have the installer file in another folder you'll need to point to it.

Once the two drives are reformatted and joined into the RAID install the OS. If that fails with Mojave I think you'll need to fall back to Mavericks to make this work.

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