Understanding APFS Containers and Partitions
Disk Utility in newer macOS versions can be confusing because it uses APFS Containers which share space dynamically. For a dual-boot setup with Windows, you need to follow a specific method.
Correct Partitioning Method:
- Physical Disk Level: In Disk Utility, click 'View' > 'Show All Devices'. Select the WD_Black physical disk (top level).
- Erase as GUID: Erase the entire disk as Mac OS Extended (Journaled) first. This forces Disk Utility to create traditional partitions instead of APFS containers.
- Partition: Now click Partition and create two 1TB volumes. Format one as Mac OS Extended (for High Sierra) and the other as MS-DOS (FAT) (for the Windows installer to reformat to NTFS later).
- Convert to APFS: Once you install High Sierra, the installer will automatically convert that specific 1TB partition to APFS without touching the Windows partition.
Original Question: "Question about partitioning SSD"
I have 2TB wd_black SSD that I'd like to partition into two 1TB partitions, one for Windows 11 and one for Mac OS High Sierra.
When I'm partitioning the SSD in Disk Utility it's a bit confusing what's going on. I formatted the disk first as APFS with GUID partition mapping and it already partitioned the disk into two partitions but both are showing the size of 2TB. And when I go to partition this disk it only allows me to partition one of them. The other one is showing as the hard drive I renamed it when I formatted it and the other is "APFS Physical Store disk3s2".
So should I just disregard this and just partition the other partition into two 1TB disks and not worry about the computer thinking that there's some extra 2TB "ghost partition" or am I doing something wrong here? Also is there anything else I should take into consideration about formatting and partitioning this disk so it's compatible with OpenCore?
These are just "extra" OS's that I'm installing on my Mac pro 5,1 for projects. I already have on this computer installed on one partitioned SSD both Monterey and Windows 10 which work fine.
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