One line would pass the full buckets from thew ell to the fire and the buckets would be handed back so they are constantly crossing each other one full for one empty. Let’s think this like an old fashioned fire brigade using buckets of water passed between people in a line. It was designed with PCIe/NVMe drives which have a wider I/O and many more buffers. APFS is a very chatty dialog unlike what HFS+ uses. Now the other shoe drops! SATA based drives don’t run well with APFS! Without getting deep here. So when you prepped the drive externally or in the other system the firmware was no updated with the version that understands APFS! This gets into the fact HS alters the file system of SSD’s to APFS (if you had installed a HDD the file system would have stayed at HFS+). OK, why? Your systems firmware was still running an older version that can’t be upgraded to High Sierra until you get the Sierra. ![]() Now if you really need High Sierra install that afterwards! ![]() Now using a bootable USB OS installer with Sierra Not High Sierra! Install Sierra onto your system. Now install the SSD into the system in question. ![]() From your working system connect the SSD externally using a SATA to USB adapter (or drive case via USB or TB) Reformat it to GUID Journaled file system (HFS+).
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