MacOS 10.15 (Catalina) was released on 7 October 2019. The newly released update, macOS Catalina, is available to users who are running OS X 10.9 (Mavericks) or later on their Mac. With this latest iteration, Apple replaces macOS Mojave sporting newly updated features. A: Answer: A: Yes, Catalina has two volumes and from what I have read here is that you will need to erase the entire drive (top entry in Disk Utility) and reinstall from there. If you do not erase, you will most likely wind up with two Mac HD Data. If you are giving away the device, you need to erase the drive anyway. Download: macOS Big Sur, macOS Catalina, macOS Mojave, or macOS High Sierra These download to your Applications folder as an app named Install macOS version name.If the installer opens after downloading, quit it without continuing installation. Step 4: If your current macOS version is Catalina, Mojave, Big Sur, or (in most cases) High Sierra, select the format APFS. If your current macOS version is older than these, select the macOS Extended (Journaled) format. Step 5: For the Scheme, choose GUID Partition Table. Press and hold Command + Option + R.This allows you to reinstall the latest version of macOS that is compatible with your Mac computer from the internet. Press and hold Shift + Command + Option + R. This option allows you to reinstall the macOS that came with your Mac, or the closest version still available. Press and hold Command + R.
Hi may9901,
Thanks for reaching out in Apple Support Communities. I understand that you're encountering an error regarding your internet connection when trying to complete the macOS Catalina install. I see you've tried to install twice and continue to see the error and the other Mac in the household didn't have an issue. I know it's important to keep your devices up-to-date; I'd like to help. First, I'd recommend trying to install the upgrade using safe mode: Use safe mode to isolate issues with your Mac
If the installation fails again, try with a test user account: How to test an issue in another user account on your Mac
I'd also suggest reviewing the information in the resource indicated in your screenshot if you haven't already, although it mentions Mojave, the steps should apply to a Catalina install as well: If error 'com.apple.OSInstallerSetup.error Code=551' occurs when installing macOS
Let me know what you find.
Reinstall Macos Catalina Without Losing Data
Reinstall Mac Os Catalina From Usb
Best Regards.
Reinstall Macos Catalina Without Internet
Oct 18, 2019 11:41 AM
I am prepping my 2015 MacBook to return for trade on new M1 Air. I have erased the drive using Disk Utility and then used the MacOS Utilities to reinstall MacOS Catalina. I have followed the support instructions precisely and run the reinstall MacOS utility twice. Each time I get the error message “Could not create a preboot volume for APFS install”.
Disk Utility shows Macintosh HD as an APFS Volume with 2 Disk Image Volumes: macOS Base System (Mac OS Extended) and InstallESD (Mac OS Extended) The Macintosh HD volume is 250.69 GB, with 15.99 GB used and 232.95 GB free. The disk image volume macOS Base System shows 2 GB total with 1.35 GB used and 658.4 MB free. The disk image volume InstallESD shows 7.89 GB total with 7.77 GB used and 120.6 MB free.
I've already got the new MB Air and the return mailer for the trade. How do I fix this?
MacBook
Reinstall Macos Catalina Without Losing Data
Posted on Dec 3, 2020 6:59 AM