Good Day
I am having iMac (21.5-inch, Mid 2011) - Model : A1311 , I want to tis iMac for online search, am installing macOS High Sierra from a bootable usb , the installation is going through until its gave me this error disk is lock. I tried to erase disk, tried to make a new partition but its just giving errors disk cannot be unmounted.
Please help
Quinton.
You should be able to use the Disk Utility in Internet Recovery Mode to Erase and Reformat the Internal drive.
see > Use Disk Utility to erase an Intel-based Mac - Apple Support
(try formatting Mac OS Extended (Journaled) instead of APFS)
Then you should be able to Install the offered OS X while in macOS Recovery Mode.
If the offered OS X is not High Sierra, install it and then Upgrade to High Sierra when you are up and running.
Hi, How do I startup from the external drive or th OS X base system.
Thanks
Hi,
Which version of High Sierra Installer must I download , and must it be a dmg file.
Thank you.
Good work. It should install the same as it did on the external drive.
The Partition cannot be resized, Operation failed- Disk is Locked.
