I'm trying to upgrade my late-2012 mini stock HDD with Samsung 870 EVO SATA 2.5" SSD. At first I was having issue with getting disk utility to detect the drive, i thought it was a loose connector so i redid my setup and it popped up. Then during the OS installation using bootable Catalina USB the prohibitory sign pops up during the restart and i had to manually hold the power button and cold boot the mini. After the boot it continues the installation and landed me on the first start up interface. Everything seems working ok, until I realized every time a reboot is initiated, whether it's me or via system update for example the prohibitory sign always pops up while the system tries to boot the OS. However if i powered off the device and turn it back on the system will be able to load the OS successfully.
I then replaced the SSD back with HDD and the problem disappeared, so I know 100% it's the SSD that causing this issue. Anyone experienced this before? I read from this forum that Samsung has not released new firmwares for 870 EVO. I've checked here https://www.samsung.com/semiconductor/minisite/ssd/download/tools/ and confirmed it wasn't there (one option for 870 QVO, not EVO). Appreciate your feedback and if you know how to fix this i really appreciate if you can share what you did to fix this issue, thank you.
Update 20/9: I have tried using another SSD from OWC Electra 6G, when i tested i've still getting the prohibitionary sign, and it still occurring in the middle of OS install. I thought there's an issue with the SATA cable, but when i put the original hard disk back to the mini the issue disappeared, i do not think i broke the SATA cable. My next plan is to try to use a sata-to-usb cable and install the OS in the new SSD that way, and then try to plug it to the SATA cable inside. If anyone have a better idea, please let me know, thank you.
Update 22/9: I finally got the thing to work properly. The biggest problem initially was that i thought i can just yank out the old HDD out of mini, slotted in the new SSD, and uses the USB bootable to install the OS. Apparently the right way to do, is to keep the HDD in the mini, use SATA-to-USB cable to connect the new SSD to the USB slot, then run recovery mode, and use it to 'install the Mac OSx to the SSD drive via the USB'. Then after that's done I just need to swap the HDD with SSD, and the thing runs flawlessly. So, perhaps the EVO 870 weren't the problem after all. However for this case i have already returned it and bought an OWC Electra SSD instead. So there you go, hope this helps if anyone got stuck upgrading your mini.
I then replaced the SSD back with HDD and the problem disappeared, so I know 100% it's the SSD that causing this issue. Anyone experienced this before? I read from this forum that Samsung has not released new firmwares for 870 EVO. I've checked here https://www.samsung.com/semiconductor/minisite/ssd/download/tools/ and confirmed it wasn't there (one option for 870 QVO, not EVO). Appreciate your feedback and if you know how to fix this i really appreciate if you can share what you did to fix this issue, thank you.
Update 20/9: I have tried using another SSD from OWC Electra 6G, when i tested i've still getting the prohibitionary sign, and it still occurring in the middle of OS install. I thought there's an issue with the SATA cable, but when i put the original hard disk back to the mini the issue disappeared, i do not think i broke the SATA cable. My next plan is to try to use a sata-to-usb cable and install the OS in the new SSD that way, and then try to plug it to the SATA cable inside. If anyone have a better idea, please let me know, thank you.
Update 22/9: I finally got the thing to work properly. The biggest problem initially was that i thought i can just yank out the old HDD out of mini, slotted in the new SSD, and uses the USB bootable to install the OS. Apparently the right way to do, is to keep the HDD in the mini, use SATA-to-USB cable to connect the new SSD to the USB slot, then run recovery mode, and use it to 'install the Mac OSx to the SSD drive via the USB'. Then after that's done I just need to swap the HDD with SSD, and the thing runs flawlessly. So, perhaps the EVO 870 weren't the problem after all. However for this case i have already returned it and bought an OWC Electra SSD instead. So there you go, hope this helps if anyone got stuck upgrading your mini.
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