ankit7 0 Newbie Poster

hiiii
I am having problems in creating new drives in windows vista.....To create new drive i first go to "disk management" then i go to "shrink volume" option available in drive which is having space....
When my disk is created i open "simple volume wizard" in which when i format the volume then it give this error "you cannot create a new volume in this unallocated space because the disk already contains the maximum number of partitions".
please help....