I’m trying to upgrade a MacPro 6,1 trashcan with a new 4TB SSD. I updated the machine to 10.14 while the original Apple SSD was installed so it updated the firmware to recognize non-Apple SSDs. After installing the new SSD, the OS I want to use (Yosemite 10.10) no longer recognizes the SSD. Later OSes will.
@paulrickards interesting. i've never tried installing Mavericks or Yosemite with an NVME.
what model of nvme are you using? some of the samsung drives have known incompatibilities. some are firmware upgradeable (in windows).
either way, that wouldn't explain why you're able to boot in later OSes 🤔
@paulrickards i believe apple sold at least 1TB ssd for the 2013 - perhaps even larger if you do some digging... since that SSD pin layout was common to several MBP models as well.
i had completely forgotten about the 10.13+ NVME limitation - i was forced to run HS on my 5,1 years ago because of that.
@paulrickards by recognizes I assume you mean in Disk Utility. So it’s not an APFS vs HFS+ issue, considering Yosemite is close to that switchover point.
@treellama Right. Booting into 10.10 installer and using Disk Utility, the 4TB SSD doesn’t show. Also, putting the MacPro into target disk mode, the drive doesn’t show on other 10.10 machines: only on machines running 10.11+.
Additionally, I used Disk Utility on 10.11 to restore my original 10.10 drive to the MacPro w 4TB. It starts booting but hangs and then shows the prohibitory sign.
It’s like the firmware allows non-Apple SSDs and blocks anything before 10.11 from booting.
Add comment