WPD Devices: Deny write access This policy setting denies write access to removable disks, which may include media players, cellular phones, auxiliary displays, and CE devices. If you enable this policy setting, write access is denied to this removable storage class. If you disable or do not configure this policy setting, write access is allowed to this removable storage class.

(1) GPO: User Configuration\Administrative Templates\System\Removable Storage Access!WPD Devices: Deny write access (2) REG: HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\RemovableStorageDevices\{6AC27878-A6FA-4155-BA85-F98F491D4F33}!Deny_Write