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As me and Acronis stated: if you create an UEFI compatible stick it needs to be FAT32 and cannot be formatted with NTFS. The problem will occour if you make an bootable USB stick that is larger than 32GB AND use FAT32. When using a 64GB USB stick under Windows 10, Rufus will still format it, as Large FAT32 or exFAT, which is not compatible to FAT32.
RUFUS CREATE BOOTABLE USB NOT BOOTABLE WINDOWS 7
Especially uncommon things like creating an bootable Windows 7 UEFI compatible USB stick.
RUFUS CREATE BOOTABLE USB NOT BOOTABLE ISO
Sidenote: Tools like Rufus does ease the creation of Bootable sticks of any Windows or Linux ISO file you have. (in contrary to the articles header it is not limited to Windows XP) More official information about FAT32 limitations is available here: Pretty usual 8 GB or 16 GB are enough to serve these tasks. If you need an USB stick to make it bootable or to flash your mainboard firmware, make sure to avoid an USB stick larger than 32GB size. The major issue is apparently the limitation of the filesystem FAT32, which is quite old but still commonly used for USB sticks. The Acronis KB link does lead to no explaination. When trying to create a bootable media with a 64GB stick the wizard will quit with an error message "Media cannot be formatted". This is also and especially valid for using an USB stick as Acronis bootable device. So just in case you like to buy an USB stick, make sure that you consider the limitations. I have contacted Asus and they confirmed that even the lastest UEFI firmware they have, do not support 64GB or larger sticks yet. I have tried this on several computers of several age and all of them were not able to boot from this stick, nor being recognized correctly for flashing with BIOS / UEFI internal tools like Asus EZ Flash etc. This is especially the case when you are using such a large stick in UEFI mode, which needs to be formatted with FAT32. Regularly I am unable to boot from a 64GB sized stick or being able to use it to flash a BIOS / UEFI Firmware on the mainboard because they cannot handle it correctly. I am personally very satisfied with the speed and usability design of the Sandisk Extreme series, that really deliver USB 3.0 Speed adantages in read and write actions at a good price.īe cautious to use any sticks larger than 32 GB capacity when you want to make sure that you can use them as a boot device, or to be recognized in your BIOS / UEFI firmware. While availability of cheap, voluminous and fast USB 2.0 or 3.0 sticks is really a good thing, there are caveats you need to consider.