disable automount for a specified usb device

[Andrea Squeri]

I want disable automount for a specific usb device.I have created a file
/usr/share/hal/fdi/policy/95userpolicy.fdi with those lines:

<?xml version="1.0" encoding="UTF-8"?>

<deviceinfo version="0.2">
	<device>
		<match key="block.storage_device"
string="/org/freedesktop/Hal/devices/storage_serial_JetFlash_TS256MJF110_7f3474a77ad686_0_0">
			<merge key="storage.policy.should_mount" type="bool">false</merge>
			<merge key="storage.automount_enabled_hint" type="bool">false</merge>
		</match>
	</device>
</deviceinfo>

When I insert the device it is always mounted automatically

How can disable this ?