How to Create an Internal Partition Installer for OCLP Upgrades
For users wishing to install macOS via OpenCore Legacy Patcher on a Mid-2011 iMac (iMac12,1 or iMac12,2) without using a USB flash drive, it is possible to create an installer partition directly on the internal storage drive. This guide outlines this advanced installation technique.
1. Prerequisites
- Target Hardware: iMac Mid 2011.
- Required Tools: OpenCore Legacy Patcher application, Disk Utility.
2. Compatibility Snapshot
- Supported OS: macOS High Sierra, Mojave, Catalina, and Big Sur can be installed using this method.
3. Installation Preparation
- Create Installer Partition: Open Disk Utility. Select your internal hard drive, click Partition, add a new partition of 16GB size, set the format to Mac OS Extended (Journaled), and name it "Installer".
- Download macOS: Open OCLP, download your chosen macOS version, and save the installer to your Applications folder.
4. EFI and config.plist Review
- This does not apply to this case as OCLP handles configuration files automatically.
5. Post-Installation
- Write installer to partition: Open Terminal and execute:
sudo /Applications/Install\ macOS\ [Version].app/Contents/Resources/createinstallmedia --volume /Volumes/Installer. - Configure OpenCore: Build OpenCore inside OCLP and install it directly to your internal drive\'s EFI partition.
- Boot from partition: Restart the iMac, hold
Option, select the EFI Boot option to load OpenCore, and then select the internal macOS installer partition to start the setup.
6. Troubleshooting
Reported Issue: Cannot partition disk
- Drive formatting errors: If Disk Utility reports partitioning errors, boot into Recovery Mode (Cmd + R) to create the partition, or perform a clean install.
7. Dual Boot and Advanced Configuration
- Once the installation is complete, you can merge the 16GB installer partition back into your main volume using Disk Utility.
8. Verification, Maintenance and Rollback
- Verify Fix: Confirm the iMac boots into the macOS setup wizard.
9. References and Glossary
- iMac12,2: The Apple hardware identifier for the 27-inch Mid 2011 iMac.
Original Question: "IMac 2011"
I was wondering if I could do a install without a USB? I only want responses that attualy help. Is this possible or any other option to get a supported is on this? Thanks in advance!
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