


macOS installation failed an error occurred while preparing the installation
Jul 11, 2025 am 12:37 AMWhen encountering the prompt "macOS installation failed: an error occurred while preparing the installation", it is usually caused by an abnormal boot disk, inconsistent disk format, cache problems, or network connection failure. 1. First check whether the startup disk is complete. It is recommended to use the official installation package and createinstallmedia tool to create it, or try network recovery mode; 2. Make sure that the target disk format is APFS (High Sierra and above) or Mac OS extension, and adopt the GUID partition table, and erase the disk reformat if necessary; 3. Clean up the NVRAM/PRAM settings, press and hold Option Command PR for about 20 seconds when powering on to reset the underlying parameters; 4. Change the network environment, use a wired connection, turn off the firewall or proxy, and view detailed logs at the terminal to assist in troubleshooting problems.
When encountering the prompt "macOS installation failed: an error occurred while preparing the installation", it usually means that the system encounters problems in the preparation phase while trying to install or upgrade macOS. This problem may be caused by a variety of reasons, such as mismatched disk format, hardware compatibility issues, network connection abnormalities, or temporary file corruption, etc.

Here are some common situations and solutions that can help you troubleshoot and resolve problems.

1. Check whether the boot disk/recovery partition is complete
If you are installing macOS through a USB boot disk, first make sure that the boot disk itself is fine. Sometimes the downloaded image is incomplete, or an error occurs during the production of the startup disk, which will cause the preparation to fail.
- Make sure you are using the macOS installation package downloaded by the official channel (such as Apple's official website or App Store)
- It is recommended to use the
createinstallmedia
command line tool when creating a startup disk. - If you are not sure if the boot disk is normal, you can try re-made
If you are installing from recovery mode (entering in Command R), it may be that the recovery partition is damaged. You can try Network Recovery (Option Command R) to reload the remote installation environment.

2. Check the disk format and partition structure
The target disk will be formatted before macOS is installed. Preparation can also fail if the disk format is incorrect (for example, not an APFS or Mac OS extension format), or if there is a problem with the partition table.
You can do this:
- Enter "Utilities" -> "Disk Utility" in the installation interface
- Check the format of the target disk:
- If it is macOS High Sierra or above, it is recommended to use APFS
- If it is an earlier version, you can choose Mac OS extension (log-style)
- If the format is wrong, try to erase the disk and reformat it
- Also make sure the disk partitioning scheme is GUID partition table (GPT)
?? Note: Ejaculate the disk and clear all data. Please back up important information in advance.
3. Clean up cache with NVRAM/PRAM
Sometimes some temporary cache or system settings remain can cause errors in the installation process. You can try cleaning up the NVRAM or PRAM settings.
- Wait for a few seconds after shutting down
- Press and hold the Option Command PR key immediately when powering on again
- Lasts for about 20 seconds until you hear the second start-up sound (if any) or release when you see the Apple logo appear again
This step helps reset some underlying parameters and may fix some of the preparation phase issues.
4. Try changing the network or turning off the firewall
If you are installing from Option Command R, network connection is important. Sometimes, DNS resolution failure or network instability can lead to the failure to download the necessary installation components.
You can try:
- Change the network environment (such as changing from company network to home network)
- Use a wired connection instead of wireless
- Temporarily turn off firewall or proxy settings
In addition, during the installation process, you can also open the terminal to view the log and enter log show --predicate 'subsystem == "com.apple.install.osinstallersetup"
to obtain more detailed error information and help locate the problem.
Basically, these common investigation directions are all about these common investigations. Although the error seems a bit scary, it can be solved in most cases through the above method. The key is to be patient and check step by step and don’t rush to draw conclusions.
The above is the detailed content of macOS installation failed an error occurred while preparing the installation. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undress AI Tool
Undress images for free

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

Reasons and solutions for scipy library installation failure, specific code examples are required When performing scientific calculations in Python, scipy is a very commonly used library, which provides many functions for numerical calculations, optimization, statistics, and signal processing. However, when installing the scipy library, sometimes you encounter some problems, causing the installation to fail. This article will explore the main reasons why scipy library installation fails and provide corresponding solutions. Installation of dependent packages failed. The scipy library depends on some other Python libraries, such as nu.

What should I do if the scipy library installation fails? Quick solution sharing, specific code examples are required scipy is a powerful Python library widely used in scientific computing, providing many functions for mathematical, scientific and engineering calculations. However, when installing scipy, sometimes you encounter some problems that cause the installation to fail. This article will introduce you to some common scipy installation failure problems, and provide corresponding solutions and specific sample codes. Problem 1: Missing dependent libraries. Before installing scipy, you need to install it first.

The functions of win10 have become more and more perfect. Many friends who use win7 system also want to switch to win10 system. However, how should we solve the problem when the installation fails during the upgrade of win7 to win10 system? Let’s take a look below. 1. Method 1: 1. If we can enter the system, we will delete the file in the picture below. 2. Then win+R to open run, enter cmd, and confirm. 3. Enter the following command, as shown in the figure. 4. Open the Control Panel, click the System and Security button, then click System Options, enter the page and click WindowsUpdate in the lower left corner. 5. Afterwards, it will check for upgrade updates, automatically download and install win10. The above is to solve the problem of installation error when upgrading win7 to win10.

Win7 users reported that the graphics card driver cannot be installed and the screen is blurred. Next, I will share with you the steps to solve the problem of Win7 unable to install the graphics card driver. 1. Use the shortcut key win+r to open the window, enter the gpedit.msc command and press enter, as shown in the following figure: Open User Configuration - Administrative Templates - System - Driver Installation, double-click the device driver code signature. 3. Click Enabled, select Warn when window detects a driver file without a digital signature, and click the OK button, as shown below: Well, that’s it for this article, I hope it will be helpful to my friends. Help, after reading "What to do if the nvidia driver installation fails" "Detailed introduction: Win7 cannot install the graphics card driver solution steps

Solutions to failed sound card driver installation: 1. Confirm the sound card model; 2. Download the correct driver; 3. Install the driver; 4. Check the device manager; 5. Restart the computer; 6. Contact technical support; 7. Use Third-party driver installation software; 8. Manually update the driver; 9. Reinstall the system; 10. Check for hardware problems.

Solving the problem: Reasons and solutions for PHP8 installation failure, specific code examples are required. With the development of the PHP language, PHP8, as the latest version, brings many exciting features and optimizations, attracting the attention and use of many developers. However, during the installation and configuration of PHP8, you may encounter some problems, such as installation failure. This article will discuss the reasons why PHP8 installation fails and provide solutions. It will also give specific code examples to help readers better solve the problem. 1. Reasons why PHP8 installation failed

The main reasons for MySQL installation failure are: 1. Permission issues, you need to run as an administrator or use the sudo command; 2. Dependencies are missing, and you need to install relevant development packages; 3. Port conflicts, you need to close the program that occupies port 3306 or modify the configuration file; 4. The installation package is corrupt, you need to download and verify the integrity; 5. The environment variable is incorrectly configured, and the environment variables must be correctly configured according to the operating system. Solve these problems and carefully check each step to successfully install MySQL.

What should I do if the Win10 installation fails and the screen goes black on startup? With the continuous development of technology, Windows 10 has become the preferred operating system for many computer users. However, sometimes we may encounter some problems when installing or upgrading Windows 10. One of the most common and frustrating problems is a black screen at startup caused by a failed installation. When we encounter this situation, there is no need to panic, here are some possible solutions. 1. Wait for a while: When installing or upgrading Windows 10, you may see a screen
