I've never tried this option, but at least it doesn't require any third party software. I guess you could try booting just the exFAT USB stick just in case the computer's firmware is able to boot from an exFAT drive. The article I read mentioned that when the installer needs the items from the 'Source' folder that the installer is able to locate them on the second USB stick formatted as exFAT. Most computers need to boot from a FAT32 drive which is why two USB sticks is critical. Now select the Windows' installer boot option to see if it will proceed properly. If you see an option to boot the USB stick with the Windows' installer, then plug in the second USB stick formatted as exFAT. Once completed, eject both USB sticks (give them a minute before physically disconnecting them just to make sure the file buffers are flushed.Ĭonnect the FAT32 USB stick to the computer and boot to the computer's boot picker menu. iso file, but exclude the 'Source' folder. You also want to copy all the files in the mounted. iso file to the USB stick formatted with exFAT. iso file by double-clicking it.Įrase one USB stick as MBR partition and FAT32 (msdos) and the other as MBR partition and exFAT.Ĭopy all the files from the mounted. I recently stumbled across a simple method that may work. I may have some notes stored somewhere.I've tried multiple options in the past without success ever since the one Windows file grew larger than 4GB. I forget how I created a bootable Windows USB installer from an. I think success depends on exactly what PC you have since each PC BIOS contains so many quirks. iso files, and even apps to create a bootable Win10 USB installer from the Win10. If you search online you will find instructions for splitting the 4GB file into two separate files (I did so using a Linux utility - may be able to access on a Mac using Homebrew), to use exFAT or NTFS for the USB installer, use a Linux USB boot disk with support for booting. I'm usually pretty good about figuring this out, but I had to give up due to time constraints. I tried making a Windows 10 USB boot disc a year or so ago shortly after the Win10 installer included a 4GB+ file, but I was unable to get the PC to boot regardless of how I made the Win10 USB installer. It used to be really easy making a Windows UEFI booting USB using macOS, but now that one of the Window's installer files is over 4GB in size it has become more difficult. How does your PC boot? Legacy MBR or UEFI? Does your PC have an optical drive? can I install using this at all?Īny help is much appreciated as given everything is so fresh I would expect this to be a pretty seamless process. Speaking of, the ISO file I have is Win10_20H2_English_圆4.isoġ) Could the issue be the flash drive I have?Ģ) Could the issue be that it's Windows 20H2 and not 1909? If so, how can I get the 1909 iso file?ģ) I bought the Windows10 box with the actual Microsoft USB stick provided, as well. I've also made sure to unmount the Windows ISO file. I've tried most suggestions online of erasing the flash drive and formatting to MS-DOS FAT with Master Boot Record as the scheme. I'm using a 128GB SanDisk Cruzer USB 2.0 Flash Drive. When I try to run bootcamp assistant, it tells me that an error occurred while trying to format the disk device. I'm running Catalina on it and it's basically a brand new computer with not much on it. Some important specs, my 3TB HDD recently failed and I switched it out for a 2TB Evo Samsung SSD. I'm trying to install Windows 10 on my imac 27 inch late 2013. Bootcamp assistant not formatting usb Hi everyone,

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