internal static extern ErrorCode StorageUnsetStateChanged(int id, StorageStateChangedCallback callback);
internal static extern ErrorCode StorageSetStateChanged(int id, StorageStateChangedCallback callback, IntPtr userData);
internal static extern ErrorCode StorageUnsetStateChanged(int id, StorageStateChangedCallback callback);
internal static extern ErrorCode StorageSetStateChanged(int id, StorageStateChangedCallback callback, IntPtr userData);