Deleting files from a back up drive
I bought a new 16" MacBook Pro 2019 recently, running OS 10.15.5.
I had some files on a back up hard drive that I wanted to transfer to the new Mac. I connected the drive using a USB to Thunderbolt 3 adapter. I moved the files where I wanted them on the Mac. All of that worked just fine.
Then I wanted to delete the files from the back up drive, so I can use that drive for other things. I can't find a way to do that. When I select the drive in Finder, the "Move to trash" option is not there. I tried dragging and dropping the files into the trash bin, but that did not work. I didn't have this problem on my old Mac. Is there a trick to this that I'm missing?
MacBook Pro 16″, macOS 10.15