Hmmm... 400 G wow! You don't say which distribution you are using or the details of your installation, so I cannot give any definitive response. I assume you have Linux installed in the /dev/sda1 partition since there is a boot flag, and the partition type is 83. This partition is only about 50 MB, so again, I assume it is your boot partition. That is, it will contain the kernel and enough information to boot.
I am not as familiar with Logical Volumn Managers (the other partition of type 8e) as I would like to be, so I can't be much help troubleshooting. On the other hand, I don't quite understand your question. Perhaps it would be well for you to read up on LVM. Please do a Linux Google for LVM (http://www.google.com/linux
and search for LVM).