Restored from MacOS Catalina to Mojave and now I have two of the Macintosh HD Data left.

[samevansinworthi]

I really struggled to install Windows 10 via Bootcamp on Catalina, and after a full day of every known troubleshooting tips I could find I not the bullet and formatted the HD to Mojave and bang! Straight in. Windows 10 and Mojave.

Now, what I am left with is 2 of the secure areas that Catalina creates for the OS. They are only in the KB in size, but here they remain. I’ve tried un-mounting the drives and deleting them but they pop back.

Can anyone shed some light please?

Thank you in advance.

 

[MapleGreen]

Try different OS for formatting the drive if you can detach the hard drive like Mac Pro or older Mac mini,.. Or you can boot another OS from external drive, FOB method is the best
(Fresh out of the box) with Linux and Erase program on PartedMagic

 

[samevansinworthi]

I installed Mojave from a USB and it still kept popping back after format. It’s like it’s the rubber ball of OS’!

I’ll give your options a go though again. Thank you.

 

[Fishrrman]

I would have erased the drive completely before re-installing Mojave.

 

[mikiotty]

You probably erased the partition, not the drive, in Disk Utility

 

[cyclingplatypus]

I had the same problem - I found a solution that allowed merging it back into the drive, I installed Catalina on an external SSD. I had a clone of Mojave on another external SSD

If you only have one drive you will need to clone it first then...

Mount the drive > open Disk Utility where you need to switch 'view' from 'Only Volumes' to 'All Devices' - this gives you access to erase the entire external drive and merge them back together.

 

[crjackson2134]

Boot into a a backup disk and open a terminal session.

In terminal run this command;

diskutil list

Read the list and find the physical drive number for the problematic drive.
X=problem drive in the next command.

In the terminal session run the command;

sudo gpt destroy diskX

You have just cleared the drive of all problematic partitions and all data is gone.

Now reformat (initialize) the drive to APFS/GPT

You are ready to reinstall Mojave or clone your backup drive over to your new blank drive.

 

[samevansinworthi]

Thank you all for your responses. I’ll have a look later.