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

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Moving over an SSD from old laptop to a new one with erasing the drive

My Mac book pro mid 2012 stopped working. Seemed to be a battery issue since last time I was able to turn it on it worked fine. I bought a second hand Mac book pro (same vintage) but it was sent without a hard drive. I am away on holiday and don’t have access to my old old Hard Drive. I’m trying to install my SSD from my previous laptop without erasing everything. Any ideas? Not sure what OS X I was running but I think it was probably a recent one. Thought it would just be a plug in switch on jobby but clearly not.

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Sounds like you’re facing the HFS+ to APFS issues!

So simply the systems current OS-X/macOS will define what the systems firmware level it has. In turn that sets what it is able to boot up under.

So… A system which is running Sierra or older does not have the needed firmware update to run High Sierra or newer based drives as they will upgraded or setup with APFS file system which is alien to the older based system!

Think of it this way… Someone who only speaks one language can’t understand another! But someone who is bilingual can under stand both languages!

So your system which is running High Sierra or newer will be able to boot up from either drive!

How to fix this? You’ll need to create a USB thumb OS installer drive which you can boot your new system with. Then using it to upgrade the systems drive with a fresh install of your OS. Now what to use? I would go with Mojave and no higher if you need a APFS OS. Frankly, SATA based systems do better with HFS+ So I would look at sticking with it if you can. Sadly, Apple doesn’t allow you run the newer OS’s under the older file system.

Reference: How to get old versions of macOS

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Georgina Scott crwdns2934231:0crwdne2934231:0
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