Why is my USB write protected?

Why is my USB write protected? (Updated for Windows 11 Fixes)

USB write protected means the USB cannot be written to. But why does this happen? There can be several reasons, ranging from a corrupted flash drive to software settings in Windows that lock the device.

Originally posted in 2015, this article is now updated for modern systems, including Windows 10 and Windows 11, which introduce additional security layers that can cause USB write protection issues.

Hardware or Device Failure

It’s easy to damage a USB stick. A common cause is sending multiple write threads to the device at the same time. For example, copying large files while issuing another write command may corrupt the controller, leaving it permanently locked.

Windows Registry and Security Settings

Windows can mark a USB drive as write-protected due to policy settings or errors. Here’s how to remove this restriction on Windows 10 and Windows 11:

• Press Win + R, type regedit, and press Enter.
• Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\StorageDevicePolicies
• If WriteProtect exists, double-click it and set the value to 0. If it doesn’t exist, create a new DWORD (32-bit) entry named WriteProtect and set it to 0.
• Restart your PC and reconnect the USB drive.

Using Diskpart Command (Windows 11)

Windows 11 offers an advanced command-line tool to clear write protection:

diskpart
list disk
select disk #
attributes disk clear readonly
exit

Replace # with your USB drive number.

Windows Security – Ransomware Protection

Windows 11’s Controlled Folder Access can block external writes. Disable or adjust this setting via: Settings > Privacy & Security > Windows Security > Virus & threat protection > Ransomware protection.

File System Repair

If the drive is corrupted, run:

chkdsk E: /f

Manufacturer Tools

Brands like SanDisk, Kingston, or Nexcopy provide utilities to reset a locked USB device or reformat at a controller level.

Conclusion

Write protection errors are often recoverable and not always caused by hardware failure. With the new features in Windows 11, additional troubleshooting steps may be required before discarding a drive.

FAQ

Q: How do I remove USB write protection in Windows 11?
A: Use Registry Editor, Diskpart, or adjust Ransomware Protection settings to allow writes.

Q: Does Windows Defender block USB writes?
A: Yes, in some cases Controlled Folder Access can block external USB writes. Adjust settings to resolve this.