Ideally, the worst that can possibly happen to you is that you lose your USB disk or its contents with the installer, lose the recovery HD (well, partition), and have a Mac whose firmware was updated to support Internet Recovery, but not so as to install the latest OS. Then you would turn on the Mac, press Cmd+Opt+R to boot Internet Recovery, install the obsolete OS by downloading it from the interwebs, upgrade it in place, download the newest installer for the newest OS from the App Store, create a new USB installer, then go through the entire process of partitioning and clean-installing from the new boot environment. And all it takes is having an Internet connection through an Ethernet port (includes Thunderbolt adaptor).
But that really is the worst possible scenario. Lots of bad stuff has to happen first, like you've lost local backups, lost the USB installer, lost the recovery HD, etc. This almost never happens, but it's truly wonderful that Apple has catered for it. Take that, PC users. :) Cheers, Sabahattin -- You received this message because you are subscribed to the Google Groups "MacVisionaries" group. To unsubscribe from this group and stop receiving emails from it, send an email to macvisionaries+unsubscr...@googlegroups.com. To post to this group, send email to macvisionaries@googlegroups.com. Visit this group at http://groups.google.com/group/macvisionaries. For more options, visit https://groups.google.com/d/optout.
