Modern versions of MacOS no longer support HFS, meaning that new Macs can no longer read, mount, or write to classic HFS drives. But a fair amount of longtime Mac users continue to have older Macs and old Mac hard drives that are in HFS format, way back from the days of Mac OS 8, Mac OS 9, and early Mac OS X, and thus may wish to mount, read, and copy files from those old classic HFS volumes, to their modern Mac.

If you attempt to mount an HFS drive in modern MacOS, you will see an error message stating “Could not mount “Name”….