Immediately after formatting (without unplugging), run Rufus.
In Windows 7, the "Access to the device is denied" error in Rufus usually means another program is blocking Rufus from getting exclusive control of your USB drive. Quick Fixes Run as Administrator : Right-click the Rufus file and select Run as administrator Move the ISO File : Ensure your Windows 7 ISO file is rufus access to device denied windows 7
Downloading the ISO file directly onto the USB drive you are trying to format is a frequent mistake that leads to access denial. The /p flag unmounts the volume and makes
/p flag unmounts the volume and makes it unmountable until a physical reboot.