I have an old imac 27 that i installed windows on, but deleted osx from the hd. also formatted the disk as windows 8 by mistake. i would like to have this as an extra for my other imac27 2018. anyway to do this?
iMac 27″ 5K, macOS 13.6
Hi there,
Start up from macOS Recovery
Option-⌘-R
Upgrade to the latest macOS compatible with your Mac.
In Disk Utility>View, select Show all Devices, highlight the top left entry.
Erase the drive.
APFS won't work for Sierra or earlier, Sierra or earlier needs MacOS Extended Journaled. High Sierra won't work for APFS on earlier Macs.
If all else fails...
Use http:// instead of https://
https://www.youtube.com/watch?v=ouNQS36dIBw&t=95s
The formula for caos: APFS+macOS High+EFI… - Apple Community
How to recover a Deleted Hard Drive durin… - Apple Community
installing os on empty hd on my imac27 2013
