OK. So, I attach the external drive but I don't boot into it by using the option key. I just connect it to my computer and then run terminal. I think I have it straight now. I will do it tomorrow. Thanks for getting back to me.
Originally Posted By: artie505
I dunno. I thought
Originally Posted By: artie
You want to be booted into Sierra 2015 Macintosh HD on your internal SSD with your external HDD connected when you run the command.
was pretty explicit.
I guess this is why I'm one of the only people in my entire large family who's not a teacher.
No! You boot into your internal drive - Macintosh HD - connect your external, launch Terminal - The only Terminal you can launch is the one on the partition into which you're booted. - and run the command, which will perform a "surface scan" on your external...not any specific partition, but the drive itself.
You DO NOT need to be booted into the external to run the command on it, because, as I tried to explain, it's a "subset" of MHD, or think of it as just another folder, the contents of which happen to be macOS installations rather than documents.
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