A while ago I bought 3 Crucial MX500 SSDs, and I thought getting 6Gb/s drives would be a good thing. Then I created two thumb drive installers; one for Catalina and one for High Sierra. First try was a disaster, with very slow to timed out operation on Catalina. I tried with a 2nd fresh SSD, and the result was pretty much the same, even after replacing the ribbon cable (I now have the OEM and 2 replacements).
So I tried to back down to High Sierra on the 2nd SSD, which gave it slightly faster operation, but still much slower than the original SATA drive, and the years ago bigger replacement SATA drive, which was installed at the same time as 16GB of memory. I went through the steps to reformat from APFS to macOS extended (journaled), but today the MBP gave an EFI firmware mismatch error, and when I dug down I found that the EFI Updater is HFS+ format and the SSD is APFS format.
The first of many questions is; why didn't the reformatting of the SSD take? I know that 2017's High Sierra was the first OS to use APFS, and that it was the default, but since this is a 2012 MBP I thought it might like macOS extended (journaled) better, and WTF on the format of the EFI Updater?
So I tried to back down to High Sierra on the 2nd SSD, which gave it slightly faster operation, but still much slower than the original SATA drive, and the years ago bigger replacement SATA drive, which was installed at the same time as 16GB of memory. I went through the steps to reformat from APFS to macOS extended (journaled), but today the MBP gave an EFI firmware mismatch error, and when I dug down I found that the EFI Updater is HFS+ format and the SSD is APFS format.
The first of many questions is; why didn't the reformatting of the SSD take? I know that 2017's High Sierra was the first OS to use APFS, and that it was the default, but since this is a 2012 MBP I thought it might like macOS extended (journaled) better, and WTF on the format of the EFI Updater?