this is a weird one. I just bought a 2nd hand macbook retina and turns out that when I re-installed macOS, the storage dialog showed up a 2nd drive. The very first thought was that the main drive is a 500gb SSD and its partitioned in 2, so I went to disk utility and there where listed as two different drives. I didn't get a picture of it, but continued with the process and now with a couple of days of using the MBP I can see the two drives have almost identical used space, like a mirror.
All apps and OS where installed in the very first of the list, "Macintosh HD". But well Im going to leave you some screenshots so you can see better what's going on.
Thank you a lot.
Those are my
diskutil list results. Thanks!