This vendor specific Format Unit ATA command clears the defect reassign information (Grown Defect List) and initializes all user data sectors by executing a full format with Primary Defect List. This procedure follows the same ATA security requirements as secure erase with the exception that it does not need a password to execute. However, the command can not be started in security frozen mode, security disabled via DCO mode or when security feature set is not implemented. Currently only IBM (old), Hitachi (old), HGST (Hitachi new), Western Digital (new) and Fujitsu (ATA only) hard drives are supported.