Unfortunately we have to work around that by splitting the file in two parts, smaller than the limit of our file system on the USB drive. So far things were pretty straightforward and if it wouldn’t be for that large file it would be a piece of cake. Then I create the sources folder and copy all files from sources with the exception of install.wim: Prepare to split install.wim I typically start by copying all separate files and folders, except for the sources folder: We will take care of that later so for now, copy all remaining files to the USB drive using Finder. As you can see, the sources folder contains one large file: install.wim which is over 4GB and will not fit on the FAT32-formatted USB drive:
Make bootable osx usb from windows iso#
Once the ISO file is download as well, double click the ISO file to mount it. Copy all smaller files to the USB driveĪfter the previous step, our USB drive is prepared. Finally click “Erase” to complete the process. In the dialog, enter a name for the drive (WINUSB here), choose to format as “MS-DOS (FAT)” and “Master Boot Record” as scheme.
Then, on the left side, select your USB drive from the list and click Erase on the top left menu. In Disk Utility, choose to show all devices:
Make bootable osx usb from windows mac#
Insert the drive in your Mac and start Disk Utility. While the ISO is downloading, we can prepare our USB drive. iso file on your Mac: Prepare the USB drive When you open this link on macOS, it should show you the ability to download the ISO rather than the Media Creation tool, which is shown when opening the same on a Windows-based PC.Ĭhoose for Windows 10, then select the preferred language, go for the “64-bit Download” and wait for the download to complete to get the. Let’s start by downloading the ISO from Microsoft. To overcome this, we will need to use a tool, Wimlib, which is able to split this file in two parts. FAT32 has a file size limit of 4GB while the installation ISO now contains one file that is larger. The main reason for this is because macOS supports only FAT32 as filesystem that is compatible with Windows (and ExFat but that causes issues to boot from). Unfortunately, since some time, it became a bit more complicated to create this USB drive from macOS.
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