I am preparing to sell my 2012 Macbook Pro, which runs 10.12 (Sierra). I have erased my hard drive using Disk Utility, but am a little confused on where to go next. I'm following this official Apple guide, but my screen shows this:
In Apple's official guide, no disks are listed at the left of the Disk Utility interface. How can I get rid of this
disk1 object? Or is this something I need not worry about? Why is this appearing?