setting it to "auto" does not make it automount it.
That only tells it to auto select what file system to use e.g. VFAT EXT3 MSDOS NTFS etc.
by putting it in fstab will cause it to be auto mounted.
Looks good to me. not sure why its not auto mounting on bootup.
Maybe try moving the entry up a few in /etc/fstab??
as for not umounting it before shutting it down.
As long as you tell linux to shutdown and it goes through the shutdown sequence then your fine. Thats one of the things it does when shutting down it unmounting all mounted file systems. If it didn't do this you would have problems with the linux partitions.
So your fine doing that.
You may want to take a look at this thread.
http://www.linuxquestions.org/questi...threadid=99577