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Outdated or corrupted USB controller drivers on Windows 7 can drop connections during heavy data transfers, leading to an access denial.
Do not run Rufus with the ISO file stored on the same USB drive you are trying to format. This creates a recursive lock that triggers an access denied error. Advanced Troubleshooting Steps rufus access to device denied windows 7
Turn this protection temporarily (choose the "Disable for 10 minutes" option if available). Run Rufus. Outdated or corrupted USB controller drivers on Windows
: Security software often flags raw volume formatting as suspicious behavior. rufus access to device denied windows 7
: Ensure you do not have any folder windows open showing the contents of the USB drive.
