![]() When I made MY external drive, I made it from that drive, then removed that drive to verify I would be able to do the recovery of my system with my own equipment in the case of a catastrophic hard drive failure. I ended up having to re-setup my external with El Capitan (I'm pretty sure I did HS originally) and I also copied the HS installer (full) onto the external drive, then ran the install for El Capitan to the blank internal drive and upgraded to High Sierra.īecause I had borrowed an external drive from work that had all this equipment, I was able to redo the external drive, otherwise I would have been out of luck. If you want to install from High Sierra, you need to have a recovery partition. ![]() Newer models have the recovery built in to their firmware, but there's a few models (this one included) that support High Sierra that don't have it, so the hard drive has a recovery partition instead. So, from what I can tell, with the Late 2009 iMac, there's a catch 22.
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