I created a RAID 6 array with 6 x 1 TB SATA disks... When presenting this disk to Windows during the install I allocated 80 GBs for the system volume and left the remaining space unallocated. Once Windows 2008 R2 SP1 was installed I saw two unallocated partitions. I created a partition and that worked just fine... But now... I don't see an option to allocate the second partition. When I right click all options are gray'ed out. Why is this? Attached is a screen shot of computer management MMC.