给 U 盘分区
插入 U 盘，打开终端（不推荐用“磁盘工具”分多个区，容易出错），先找到磁盘标识符：

bash

diskutil list

找到对应 U 盘的 /dev/diskX（例如 /dev/disk2，根据容量判断，千万不要选错）。然后用一条命令分出所有需要的卷。假设你要放 Mojave、Catalina、Big Sur、Monterey 四个版本，每个分区 16 GB，可执行：

bash

sudo diskutil partitionDisk /dev/diskX GPT JHFS+ Mojave 16G JHFS+ Catalina 16G JHFS+ BigSur 16G JHFS+ Monterey 16G

Mojave

sudo /Applications/Install\ macOS\ Mojave.app/Contents/Resources/createinstallmedia --volume /Volumes/Mojave

Ready to start.
To continue we need to erase the volume at /Volumes/Mojave.
If you wish to continue type (Y) then press return: y
Erasing disk: 0%... 10%... 20%... 30%... 100%
Copying to disk: 0%... 10%... 20%... 30%... 40%... 50%... 60%... 70%... 80%... 90%... 100%
Making disk bootable...
Copying boot files...
Install media now available at "/Volumes/Install macOS Mojave"

Catalina

sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/Catalina

Big Sur

sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia --volume /Volumes/BigSur

Monterey

sudo /Applications/Install\ macOS\ Monterey.app/Contents/Resources/createinstallmedia --volume /Volumes/Monterey

 J@jon-Pro  ~  df
Filesystem              512-blocks      Used Available Capacity iused      ifree %iused  Mounted on

/dev/disk2s3             218147856    434064 217713792     1%      95 4294967184    0%   /Volumes/Monterey
/dev/disk2s2              30987856  11939768  19048088    39%    1248 4294966031    0%   /Volumes/Install macOS Mojave