I have two hard disks, one has seven partitions and the other six. It looks like you have gone slightly wrong in setting up the disk. What you should have is one primary partition followed by an extended partition of the remaining space. In the extended partition is where you would have the logical drives. As you can see in the image, the logical drives in blue are all grouped into one extended partition in green. Go here
http://www.ntfs.com/logdrives.htm for a better explanation.