How to FDISK my slave drive

I HAVE A 40GIG slave hdd. I want to change the size of my partitions on it.
When I check in FDISK.It is listed as Ext. Dos partition using 100%, with logical Dos drives when I clicked on showing the log drives it says "No log drives defined" tried del log drives but same message comes up, tried del the Ext Dos partition but came up saying I had log drives so wouldn't del the Ext. partition till they were removed. I have seen the solution for this somewhere just can't remember where,
Any one help, please,
Bob

Unable to Delete a Partition or Logical DOS Drive Using the Fdisk Utility
("Cannot delete Extended DOS Partition while logical drives exist" / "No Logical Drives defined" [?!])
http://support.microsoft.com/kb/q261473/

Removing Non-DOS Partitions with Debug
http://support.microsoft.com/kb/106419/EN-US/

How to Use the Fdisk Tool and the Format Tool to Partition or Repartition a Hard Disk
http://support.microsoft.com/kb/255867/EN-US/