With the backup recommendation out of the way, let’s get started with the error messages.Ĭould Not Write Installation Information to Disk You can find a large number of external enclosures, drives, and SSDs, as well as a portable and easily-carried-with-you Envoy Pro EX high-performance USB 3 or Thunderbolt bus-powered SSD storage.
If you don’t have a backup system in place, I highly recommend investing in one before you install a new version of macOS. Having a Time Machine backup or a clone of your current system can be a lifesaver. Some of the installation issues we’re going to mention can cause loss of data. Installation Issues Commonly Seen with macOSīefore we get too far along, I want to point out the obvious: don’t install a new version of the Mac operating system without having a current backup. With any luck, you may be able to either correct the issue, allowing you to finish the installation, or prevent the problem from occurring in the first place. Once you have your system installed (even before you install XCode), do a Time Machine backup so that you have an image of your system in it's pristine state in case you have to install macOS on a blank drive again.In this guide, we will look at some of the installation problems that tend to occur with new releases of the Mac operating system.
Use Internet Recovery as detailed above.If your connection is flaky, it's likely to fail. You'll be downloading not just the installer, but the entire OS. It's unlikely that the iMac wouldn't have been upgraded in the last 8 years, but if it hasn't, you need to install Lion (10.7.3) and then install the patch ( download here) The EFI should have been patched via normal system upgrades. If it's pre High Sirra, you'll have to install that version then upgrade. Internet Recovery (hold ⇧Shift ⌥Option ⌘Command R) will install the last version that was installed on that Mac.
The late 2010 iMac (both 21" and 27" models) had the capability of having their EFI upgraded to support Internet Recovery. Is is possible to get a late 2010 iMac with a blank/new hard drive up and running with the latest OS and XCode?
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