Unmount your USB disk diskutil unmountDisk /dev/disk#.Type diskutil list disk# where disk# is the number corresponding to your USB drive to verify that this is the disk you want to format.Search for your USB drive number listed as disk, easy hint is to match the size of your USB card to the listed disks.Have a USB drive ready, for formatting information see Formatting subsection.Ĭreate a GUID formatted flash drive using diskutil command in Terminal.You need to have an account at tonymacx86 to be able to download 2 programs needed for this guide.To follow the link you might need to open it in Safari and have it redirect to Mac App Store.
Start downloading macOS High Sierra from App Store on macOS computer.Installation instructions for macOS High Sierra on PC.
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