You need special partitioning software to manage partitions like this. The standard one is Partition Magic from Symantec. But you'll be able to find cheaper shareware on the usual download sites.
Hope this helps.
Right now I have my slave hard drive split in half and set as drives g and f. In another forum I found how to delete my partition g and so I did, but it didn't make one big drive. Instead it deleted the g and says that it is unallocated. How do I transfer g's disk space to f so that I have one big hard drive again?