You can still make an external macOS bootable drive, but Apple's tighter security procedures mean you have to prepare for it before your internal drive fails. Here's how to do it all, and what's been ...

Disk 1 = 750 7200rpm (C boot, system, primary partition. I'm thinking of adding a SSD as a boot drive with a fresh install and a 2TB green. Here's my question. How does Disk 0, Disk 1, etc. matter?