For extra protection, Windows 10 allows enabling a special policy that prevents write operations to fixed drives that are not protected by BitLocker. Non-protected drives will be mounted as read-only to ensure that all your sensitive data is written to an encrypted storage device.
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Note: In Windows 10, BitLocker Drive Encryption is only available in the Pro, Enterprise, and Education editions.
To deny write to fixed drives not protected by BitLocker, do the following.
- Press Win + R keys together on your keyboard and type:
gpedit.msc
- Group Policy Editor will open. Go to Computer Configuration\Administrative Templates\Windows Components\BitLocker Drive Encryption\Fixed Data Drives.
- On the right, double-click the policy Deny write access to fixed drives not protected by BitLocker.
- Set it to Enabled.
- Restart Windows 10 to apply the restriction, and you are done.
Note: Local Group Policy Editor (gpedit.msc) is only available in
Windows 10 Pro, Enterprise, and Education editions.
Alternatively, you can enable or disable the policy with a Registry tweak.
Registry Tweak to Deny Write to Fixed Drives not Protected by BitLocker
- Open Registry Editor.
- Go to the following Registry key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Policies\Microsoft\FVE
Tip: See how to jump to the desired Registry key with one click.
If you do not have such a key, then just create it.
- Here, create a new 32-bit DWORD value FDVDenyWriteAccess. Note: Even if you are running 64-bit Windows, you still need to use a 32-bit DWORD as the value type.
- Set it to 1 to disable activate the policy.
- To make the changes done by the Registry tweak take effect, you need to restart Windows 10.
To save your time, I made ready-to-use Registry files. You can download them here:
The undo tweak is included.
That's it.
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