diskutil list
By using the official createinstallmedia tool, you ensure that all hidden boot partitions and recovery files are correctly placed, providing a much more stable installation than simply dragging and dropping files.
: Obtain the macOS installer from the Mac App Store or Apple's support pages.
For those comfortable with the command line, you can convert the DMG to a CDR/ISO, then DD it to the USB.
: Use Disk Utility to erase your USB drive (at least 16GB) as Mac OS Extended (Journaled) with a GUID Partition Map .
The resulting file may have a .img.dmg extension — you can use it as-is.
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