In some cases, the USB drive itself may be failing, or a physical write-protection switch might be engaged.
If the USB drive has a corrupted file system or improper partition structure, Windows 7 might deny access. Open Command Prompt as Administrator ( cmd ). Type diskpart and press Enter. Type list disk and identify your USB drive number. Type select disk [number] (e.g., select disk 2 ). Type clean . Close the prompt, and try Rufus again. 5. Check for "Locked" Device Errors (Zeroing the Drive)
Windows 7 might be trying to automatically read or index files on the drive the moment it connects.
Open the Start menu, type cmd , right-click cmd.exe , and select . Type diskpart and press Enter. rufus access to device denied windows 7
Antivirus and security suites, while essential for protection, can sometimes mistakenly flag Rufus as a threat and block its access to your hardware.
: Within Rufus, try pressing Alt + , (comma) to disable exclusive locking, which may allow it to bypass certain access restrictions. Advanced Recovery
If DiskPart is also giving errors, the volume is likely mounted in a way that prevents raw writes. Force-unmount it: In some cases, the USB drive itself may
Using Rufus to create bootable USB drives is a straightforward process, but encountering the frustrating "Access to the device is denied" error in Windows 7 can halt your progress. This error (often accompanied by error code 5) typically occurs because Rufus is unable to obtain the necessary low-level access to the USB drive, often due to security software, user permission issues, or file system locks.
DiskPart example to wipe and reformat:
Open Task Manager ( Ctrl + Shift + Esc ) → End explorer.exe . Don't worry – you can restart it later via File → New Task → explorer.exe . Type diskpart and press Enter
Look for the policy named .
This will erase all data on the USB drive.
Apps like Dropbox, Google Drive, or OneDrive may attempt to scan the USB for media files the moment it is recognized. Close these apps completely from the system tray.