Hey guys, I just want to share with you the solution to this disk error of the 13-inch MacBook pro mid-2012. The error occurred when we add the second drive in replacement of the optical drive.
The solution includes typing lines in the terminal:
diskutil list
diskutil eraseDisk APFS PNYmac /dev/disk0
Note: PNYmac is the drive name I set for my drive. You can set yours as well.
Warning: ALL files will be DELETED if you use this solution.
#macbook #SSD # diskerror