Make a new installation startup disk for macOS

prior to Mac startup key combination recovery mode recovery mode The problem of network recovery is mentioned in，In fact, in the end, I couldn't successfully use the network recovery，The reason is that my hard drive is NVMe，But I don’t have an original hard drive to use，So I cannot update the motherboard firmware by downgrading and then upgrading，This makes the latest recovery mode unusable，The old recovery mode does not recognize the hard drive。

to this end，I need to make a just not so new，But it is new enough to support the NVMe installation disk，after all，To install the system，You have to go to recovery mode, right?。

Here I downloaded macOS 11.2.3 Big Sur，Other mirror images are similar，Just the name of the installation package is different，The name and location of the tools inside have not changed。

Ready to work

First we need to download the installation package，Everyone has their own abilities，Fortunately, there are many bt seeds that can be found online，The download speed is also very fast。Apple officially provides download channels in the App Store，But unfortunately if you are using M1 chip equipment，It may not be downloadable (but the boot disk can still be made)。

Then there is a USB flash drive of at least 16GB，Or mobile hard drive or something。

note：The contents of the USB flash drive will be cleared，Please prepare in advance and format this U disk as HFS+ Format，Can't be formatted as APFS，Boot into GUID mode。

Make

First we find the command to use，The path is in the system installation package (for example Install macOS Big On.app )middle： xxxx.app/Contents/Resources/createinstallmedia ，Note that "xxxx.app" is the name of your installation package，So for example, I should be like this： /Volumes/Install\ macOS\ Big\ On/Install\ macOS\ Big\ On.app/Contents/Resources/createinstallmedia Because the dmg file I downloaded directly，Don't unzip，Just mount the image directly to ensure that the file can be accessed。

Then find the U disk we prepared，Very simple，After you plug in the U disk, the name that comes out on the upper right corner of the desktop is the name we want to use，For example, mine is Untitled ，Then the path of my U disk is /Volumes/Untitled 。

There is a potential risk here，That is, you may have multiple hard drives with the same name... so please pay more attention，At this time, it’s best to disconnect the unused mobile hard disk and other devices，Avoid data loss。

Then we use the command

To generate a boot disk，Before the official start, the terminal will ask again if you want to continue，If you continue, the data in the target medium will be cleared。Of course our U disk has been formatted，So enter y here。

Processing speed depends on the speed of your U disk，My USB3.1 32GB U Disk took less than 5 minutes in total，for your reference。

References

• How to Create a Recovery Drive to Rescue Your Failing Mac

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