open filer disk problem
 

I have 2 hard drives in my test openfiler box. When I did the install I did a automatic partion on the first disk. I can do whatever I want with the first disk in openfiler but the second disk is causing me problems. You will notice how the size is greyed out so basically I can't create a promary or extended partion with this disk. So I decide to go into putty and see if I can repartition the disk and format when I attemp to do so I get this wrror
/dev/hdb1 is mounted; will not make a filesystem here. So can someone out there please tell me how to handle this. I'm new to linux so I'm not up on disk management yet?

http://webpages.charter.net/mstephens1754/screen.pdf