Sometimes you may don’t want anyone else to copy, modify, or remove files on your removable USB device. Then it’s a good idea to disable write access to the USB drive. Here in this post we will show you three ways to disable or deny write access to USB drive on Windows 10/8/7.

Way 1: Disable write access to USB drive with Command Prompt

Step 1: Run the Command Prompt as administrator.

Step 2: Type diskpart and press Enter.

Type diskpart

Step 3: Type list disk and press Enter to list all disks on the computer.

list disk

Step 4: Type select disk # and press Enter to select the removable disk.

Select disk

Step 5: Type attributes disk set readonly and press Enter, so the USB drive is write protected and read-only.

set readonly

The USB drive is not writable until you remove the write-protection. To remove the write-protection, type attributes disk clear readonly and press Enter.

clear readonly

Way 2: Deny write access to USB drive by Local Group Policy

Step 1: Open the Local Group Policy Editor by typing group policy in Windows Start menu.

Step 2: Navigate to Computer Configuration > Administrative Templates > System > Removable Storage Access, and then double click on the entry named “Removable Disks: Deny write access” listed on the right-side pane.

deny write access

Step 3: Select Enabled, and click OK, so write access will be denied to the removable devices including USB drives connected to this computer.

Select Enabled

Way 3: Disable write access to USB drive by Registry Editor

Step 1: Open Registry Editor, by pressing Win + R, typing regedit, and clicking OK.

Step 2: Navigate to Computer\HKEY_CURRENT_USER\Software\Polices\Microsoft\Windows, and look for the sub-key named RemovableStorageDevices. If the RemovableStorageDevices key doesn’t exist under the Windows key, right click the Windows key and select New > Key to create a new sub-key and name it as RemovableStorageDevices.

Step 3: Right click on the RemovableStorageDevices key, then select New > Key to create a new key, and name it as {53f5630d-b6bf-11d0-94f2-00a0c91efb8b}.

Step 4: Click the {53f5630d-b6bf-11d0-94f2-00a0c91efb8b} key to highlight it. Right click the blank area of the right side pane, then select New > DWORD (32-bit) Value to create a new entry, and name it as Deny_Write.

create new entry

Step 5: Double click the Deny_Write entry and then change its value data to 1, and click OK. This will deny the write access to the USB drives connected to this computer.

change value data to 1

Step 6: Restart Windows for the changes to take effect.