Parted Magic is a customized Linux boot disk with a customized app/script which makes it easy to perform the hardware secure erase.Ĭreate a bootable Parted Magic USB drive using Etcher. To access the SSD's hardware secure erase feature requires using Linux. If this doesn't work, then I will perform a hardware secure erase on the SSD which resets the SSD to factory defaults including erasing/blanking the SSD. When this happens I will erase the beginning part of the drive with zeroes to overwrite the partition table so the drive appears completely blank. Sometimes macOS has issues dealing with a drive if something unexpected occurs. Maybe your system firmware was never fully updated so macOS is blocking you from using APFS. You should then be able to select the physical drive in the left pane of Disk Utility to erase the drive as GUID partition and APFS (top option). and the reason I've been given is that it isn't a Macintosh drive.ĭid you try erasing the whole physical drive? In order to see the physical drive in Disk Utility you need to click on "View" and select "Show all devices". When I tried erasing the Samsung drive to reformat as APFS, there was no option to select APFS. On these systems the macOS installer is unable to install the required system firmware if a non-Apple third party PCIe SSD is installed. I wouldn't expect it to have a problem erasing the drive though, but APFS is a new file system so it is hard to say if Apple could be blocking some SSDs from using it.ĪFAIK the only compatibility issue with third party SSDs is on systems using Apple's proprietary PCIe SSD connector. I do know that some Samsung SSDs have had compatibility issues with Macs, but I don't know which ones. Worst case scenario you have to boot the Catalina installer (either from a bootable USB or from Internet Recovery Mode using Command + Option + R) to erase the physical drive and perform a clean install of Catalina.Īfter several hours of Apple Support Chat two days ago, one of the support reps finally told me that the reason I couldn't reformat my drive (Samsung 860 EVO 1 TB) to APFS was because it wasn't a Macintosh drive.Īll OEMs will blame third party hardware when things don't work correctly. If the Disk Utility GUI doesn't allow it, you can try using the command line version of "diskutil" to try converting the volume to APFS on the fly. If it doesn't convert the drive, then you can try converting the drive to APFS using Disk Utility while booted into Internet Recovery Mode (Command + Option + R) or from a bootable macOS USB installer. You could try booting into local Recovery Mode (Command + R) to try reinstalling macOS Mojave over top of itself to see if it will convert your drive to APFS. Whatever you end up doing, make sure you have good verified working backups in case something goes wrong. It's all a bit confusing, so i'm going to hold off for a while until i get some answers. And at that point, which version of MacOS will it choose to install? Does it just download it from Apple and install it? I assume that it would get the latest version which would be Catalina. Is there a way to convert to APFS *without* wiping the drive, or do i have to do the Recovery Mode, use Disk Utility to erase and format the drive as APFS (is there a guarantee that APFS will not be greyed out in Disk Utility?), then choose the Install new MacOS. So i have an iMac with an internal 5400rpm IDE drive, formatted MacOS Journaled extended, which has Mojave 10.14 and i tried to install Catalina last night and got the message that the drive is not APFS so i can't install.įrom what i've read, Mojave should already be APFS but there are some circumstances where you can end up with Mojave journaled extended instead.
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