Main Disk error

Try booting into Internet Recovery Mode using Command +Option + R instead so the laptop doesn't use the local recovery mode found on the laptop's SSD. This may be why the "disk1" resource is busy since it may be linked to your macOS recovery mode installer.

Hi Rame-Tarek,

Disk Utility is showing unexpected results. The AppleAPFSMedia entry normally doesn't appear in Disk Utility.

To fully erase your internal drive, select the APPLE SSD entry, and erase using these settings:

• Name: Macintosh HD
• Format: Mac OS Extended (Journaled)
• Scheme: GUID Partition Table/Map

I've seen this type of issue before regarding the out of order listing within Disk Utility. I think I had to use the Terminal app to use the command line utilities to write zeroes to the beginning of the drive in order to destroy the partition table.

Make sure to disconnect all external devices so that you don't accidentally overwrite an external drive and destroying its data. Next launch the Terminal app from the Utilities menu while booted to the macOS installer. Issue the following commands making sure to press the "Return" key at the end of each line in order to execute the command.

diskutil  list  internal

This will list all internal physical drives and virtual volumes. You need to get the drive identifier for the physical internal drive which should be the first item in the listed output of the above command if you only have a single internal drive installed. Usually the internal drive will be identified as "disk0", "disk1", or possibly "disk2". Replace "diskX" in the following command with the correct drive identifier for the physical internal drive in the following commands.

First unmount all volumes from the physical drive (remember to replace "diskX" with the correct drive identifier):

diskutil  unmountDisk  diskX  

Now write zeroes to the beginning the physical drive (remember to replace "diskX" with the correct drive identifier):

dd  if=/dev/zero  of=/dev/diskX  bs=100m  count=10 

If these commands all complete successfully, then the partition table has been destroyed so you can close the Terminal app and launch Disk Utility to properly erase the physical drive.

Try waiting a bit after issuing the commands and try the last command again after waiting a few minutes. You can just press the up arrow key to display the previous command(s) and press the "Return" key to execute the displayed command so you don't have to retype it. Perhaps it is taking longer to unmount the APFS volume (assuming it was even mounted).

Just curious how you are booting the macOS installer since there appear to be multiple images displayed on the left pane of Disk Utility.

Also what version of the macOS installer is booted?