You may also need to first delete the "Macintosh HD" volume which may prompt you whether to also delete the "Volume Group" which you will want to allow if offered. In some cases with later versions of macOS, I have found that sometimes you must first unmount all volumes on the drive you are erasing. You cannot erase a drive you are booted from. Make sure you are booted into Recovery Mode (Command + R), Internet Recovery Mode (Command + Option + R), or from a bootable macOS USB installer. It is just some of the quirkiness that Apple hardware & macOS have developed recently. Once in a while for some unknown reason I have found this is necessary. Immediately after the failure, try repeating the procedure again. I think it should be some kind of security protocol protecting the partition area, but during the update something happened, and now the system is working on wrong way. Some more important information: All the SSD tests told me that SSD drive is healthy!!!! And SIP is disconnected in recovery mode. I have made a boot disk with Ubuntu, and tried to make a format from there, but the Ubuntu was not able to write to disk. And now I can not erase disk from anywhere. But on such a way that even the internal apple tools: terminal commands, diskutil commands can not override this. That was the point where I thought that the partition area and maybe the whole disk is in read-only mode. The most interesting was that after a direct dd command to disk0 the APFS parameters and partition data was not changed at all. after the terminal commands it looked like the Volume disappeared from diskutil, but after a reboot, everything is like at the beginning. I have made a complete backup of my disk0 with dd to another disk.Īfter that I have tried to delete and recreate APFS Volumes delete APFS container, but nothing happened in my APFS descriptors. I have made all normal steps, boot disk creation, diskutil first aid, terminal commands. After the last security update from Apple my High Sierra MacBook Pro was not able to boot. It is somehow write protected for apple tools too. Can not erase or modify any parameter of my internal ssd disk.
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