added new drive unassigned

Hi,

We did change a faulty drive (has no data on it) in slot 9 of our MD3000i with a new drive, no when I go to the MD manager the Array says optimal. When I go to the Hardware Component- Physical Disks I can see all the drives says Assigned, but the Drive 9 says unAssigned. we have 2 more new drives in the Device and I want to create a new disk group and new virtual disk from these 2 drives plus drive 9 so when I go to the option create a new disk group there I can see the unassigned disk 9 and the other 2 disks.

quesiton:

Why drive 9 says unassigned? can I go ahead and create my disk group with drive 9 and the other 2 drives?

Thanks