Why can’t I copy a large Windows 11 ISO to my USB drive?
Asked by
MellowHarbor42
I'm trying to put a Windows 11 disk image (ISO) on an 80 GB USB drive. The drive appears to have plenty of free space and is supposedly formatted as exFAT, but Windows says the file is too large for the destination. Other files copy normally. Do I need to change the format or use a special tool to make the USB bootable?
Answers
If your goal is to install Windows, don’t simply copy the ISO onto the USB as a normal file. Use a bootable-media utility such as Rufus to write the ISO to the drive. It will prepare the partitions and make the USB bootable; back up anything important first because the process normally wipes the USB.
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Another option is Ventoy. Install Ventoy onto the USB once, then copy the ISO onto it like a regular file. Ventoy lets you boot the ISO and can also store multiple installers, although installing it will initially erase the drive.
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First, check the drive’s Properties and confirm the file system really is exFAT. FAT32 has a maximum single-file size of 4 GB, so a Windows ISO or its included installation file may exceed that limit even when the drive has lots of free space. If it’s FAT32, reformatting as exFAT or NTFS will remove that limitation, but reformatting erases the drive.
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