So I was wrong, you do not have udev installed and I have no clue.
PS Please don't post the same question in two different threads, this is confusing.
[EDIT] You are not alone, see here
Seems like ext3 is simply not unsupported, thus you will have to either hack your system (good luck, but be careful) or mount manually your drive (which is my best advise).
[EDIT 2] Or simply re-format your drive using a supported file system.