iATKOS | United Kingdom

I was formatting my Imac 2015 using OpenCore until in the middle of the installation an error occurred and the imac crashed with a corrupt HD. I've tried to reform it through Disk Manager, but it just doesn't appear.

I would like to ask for help to correct this error without having to call a technician because I am Brazilian here and any maintenance related to Apple is very expensive. I also wanted to know how I can prevent this “HD corruption” from occurring again in OpenCore installations.