I've also tried Disk Utility - ran First Aid on the disk and then re-installing Sierra. I have now tried it thrice but I keep getting the same error. It failed at last step of the installation stating “ Error Occurred while Preparing the Installation” error. I restarted the MBA in recovery mode and tried to re-install macOS, after which it did some pre-checks and prompted me to install Sierra Now, when the system restarted it showed a folder with a flashing question mark (?) since it was not able to find anything to boot. So I erased the Air using the steps provided in the official Apple Support website. PS.I have an early 2015 MacBook Air - which had macOS Monterey installed that I want to exchange with my new Macbook Pro. ![]() The OS detected that I had a 1TB hard drive, but I couldn't delete the Macintosh HD partition because it was the "boot partition" and when I tried using Disk Utility to try and edit the size of my partition, it wouldn't let me increase it, as if my hard drive only had 17GB (even though in the properties it correctly said that it was a 1TB hard drive). The steps you provided to delete a partition didn't work. Is there a more reliable alternative to TransMac? I've heard of a program called gibMacOS, would that work? I don't have a Mac at my disposal (aside from my old eMac) so I don't really have a choice. I am aware that the different file systems may cause issues in making a bootable USB on Windows. ![]() I'm not very familiar with Macs, so if what you described was something else, I'd unfortunately missed that step before formatting the hard drive. What to do before you sell, give away, or trade in your Mac What to do before you sell, give away, or trade in your MacĪs for removing the partition the instructions are easy to find Ĭlick to expand.Do you mean by "boot into the recovery partition" that I needed to boot into recovery mode? Because that's what I did, and Disk Utility didn't help me there. As I seem to have said to about three OP's this week if the previous owner had followed the simple easily obtained instructions, When complete it should restart to the "Welcome" screen which will walk you through the setup process. Then install the version of MacOS you have loaded on the USB drive). You then use Disk Utility on the USB drive (it looks the same as the Recovery partition window) to erase the Macintosh HD. Ideally a MacOS installer needs to be downloaded from a Mac specific source (like the Apple App Store) then converted to a bootable installer on a USB stick using Terminal or one of a number of free third party apps.īooting from the USB installer is just a matter of holding down the Option Key on Start Up (boot) you will see the installer as a bootable option. TransMac has unreliable outcomes when creating bootable installers for MacOS you are, after all dealing with a completely different filing system. Then choose the option to Reinstal MacOS. Then use this link to get a copy of High Sierra and do the upgrade.įrom the very start what you needed to do was Boot into the Recovery partition and using Disk Utility from there Erase and Reformat the Macintosh HD as MacOS Extended (Journalled) (you cannot format a Mac HD as ExFAT). Once the installation is done, boot into it and set it up. Then go back to the main menu and click re-install macOS which will get you a new installation of Sierra. ![]() From there, go to Disk Utility and choose the drive and hit Erase (don't try to partition or do anything fancy). This will take you to the recovery console. So assuming you haven't messed up the existing drive with Sierra on it, power down the iMac and then power it back up while holding CMD+r on it. So you're going to face some issues there. This is quite a number of versions of the OS behind and most recent versions of applications you'll want to run will ask for at least Mojave or Catalina as the minimum version of the OS. Was the machine running a fresh installation of Sierra? That machine can go up to High Sierra, but that's it. There is indeed a small partition on the drive starting with macOS Lion I believe when Apple added the recovery console so that you could always get back into the machine for re-installation. It sounds like you're embarking into the Mac world from the Windows world and the just so you know the partitioning doesn't work the same.
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