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On the setup screen, do not install until you open and use Disk Utility to Repair and Erase your boot partition. Steve, reboot your Apple device holding down two keys, Command-R keys together - ⌘ -R at the same time. The installer, do you mean the Mac App Store? That way it won't self delete after you use it. Once the installer downloads to your Applications folder, quit the installer, and make a copy of it or move it out of your Applications folder. The old MacBook's HD is the standard 256 GB SSD, it's the early 2016 model.Īgain with "reinstalling the macOS overtop of an existing macOS partition," does this mean it keep the old files and docs, and only add the Recovery Partition to the Mac HD? My internet subscription is only 20Mbps tops, in real use it's less than that. I don't know how fast your Internet connection is, and I don't know the speed or type of your hard drives.įor me, on a Early 2015 12" Retina MacBook with a 500 GB SSD, reinstalling the macOS overtop of an existing macOS partition takes less than an hour.

I saw the High Sierra during last WWDC keynote (via on-line), I think I'll better wait until it's released so I don't have to do it (reinstalling the macOS) twice. Wait, so all the files and docs will not be deleted?ĭoesn't reinstall the macOS mean erasing the HD and start again from beginning? Just to note, there probably won't be anymore point updates to Sierra before the release of High Sierra (Can't really speculate though), but many people download the latest full installers and run them over their existing partitions in lieu of using the App Store Software Update feature. No, it just reinstalls overtop of your existing partition.