My Classic Mac Pro 5,1, which is a flashed 4,1 has been upgrading and running the OS without problem up to 10.13.6. Disk Utility just indicated a consistency error on the boot drive, which is a 240GB APFS SSD with 100GB free. When I tried to reboot from the recovery partition it just booted from the startup. Looking at the drive in disk utility I see there is no recovery partition. The boot disk has 100GB free with 4.8 purgeable. How do I add a recovery partition? Is it possible to add one to a free 127GB scratch SSD?