Installing macOS From the DMG file, you need to prepare to boot the USB drive and write to the mirror. 1. Prepare at least 16GB USB drive and format it as "Mac OS Extension (Log Style); 2. Use the terminal commands hdiutil verify, hdiutil mount and asr restore to write DMG to the USB drive; 3. If you only need to view or extract content, you can directly mount the DMG file and drag and install the application; 4. If you encounter write protection or permission problems, you can try to repair the disk, re-download the file, or convert the format to IMG before operating. The entire process requires ensuring that the DMG file is legal and complete before the system installation can be successfully completed.
Installing macOS from DMG files is not actually complicated, but many people will be a little confused when they first operate it. DMG is a common disk image format under macOS and is usually used to distribute software or system installation packages. If you have a macOS DMG file and want to use it to install the system, the following steps and precautions can help you complete it smoothly.
Prepare an available boot USB drive
Before you start, you need to prepare a USB drive with at least 16GB capacity and make sure it has no important data (which will be formatted during operation).
Next you can use the tool to convert the DMG file into a bootable installation media. Common methods include using command line tools hdiutil and asr , or using third-party tools such as TransMac (there are corresponding versions on Mac or Windows).
The specific process is roughly as follows:
- Insert the USB drive
- Open Disk Utility, select the USB drive and format it as Mac OS Extensions (Logistics)
- Use the terminal run command to write DMG to the USB flash drive, for example:
hdiutil verify yourfile.dmg hdiutil mount yourfile.dmg asr restore --source /Volumes/YourMountedDMG --target /Volumes/YourUSB --erase
After this step is completed, your USB drive becomes a boot disk that can bootstrap macOS installation.
Mount DMG files and use them directly
If you just want to see what is in the DMG file, or if it contains an application rather than a complete system, you can directly mount it to view it.
After double-clicking the DMG file, it will automatically appear on the desktop, just like a hard disk is inserted. You can drag and drop the App file inside to the "Applications" folder for installation.
But note: This method cannot be used to install a complete macOS system, it is only suitable for extracting content or installing ordinary applications.
What should I do if I encounter write protection or permission issues?
Sometimes you may encounter situations where DMG files cannot be mounted, prompt write protection, or permission errors. There may be several reasons for this:
- The file itself is corrupted, so it is recommended to download it again;
- Disk Utility is incompatible, try to manually mount it using terminal;
- For permission setting issues, you can select the disk in "Disk Utility" and click "First Aid" to fix it;
If it still doesn't work, you can try converting DMG to IMG format and then writing to the USB flash drive:
hdiutil convert yourfile.dmg -format UDTO -o outputfile.img
Basically these are the steps. Although it seems a bit cumbersome, it is actually not difficult to do it step by step. The key is to confirm that the DMG file on your hand is a legal and complete system image, otherwise it will not be installed normally even if the write is successful.
The above is the detailed content of How to install macOS from a DMG file?. For more information, please follow other related articles on the PHP Chinese website!
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