You can use disk druid during installation or fdisk works afterwards. if you want to. You can find more out about these products here
. There is also lots of stuff to read if you search Google.com. I am not comfortable with these linux offerings, so I use V-Com's System Commander to partition and format my HD's Learn more about SC here
. Another possibility is Partition Magic. I have not used this product, however, as System Commander has worked well for me. If you really want to use Disk Druid or Fdisk, you should REALLY read everything you can before starting and for sure, BACKUP AND DO A TEST RESTORE OF YOUR DATA.