[disappearedng]

Hi everyone
I have a system that dual boots with Gentoo.

This is my current fdisk partition table:
device____start__end___system
/dev/sda1_1_____5_____Linux
/dev/sda2_6_____515___Linus Swap
/dev/sda3_516___5614__Linux
/dev/sda4_5615__13262_FreeBSD

Now my tricky question is:
I have already partition 4 primary partitions on my harddisk.
I still have 400 GB or empty unpartitioned sp ace left.
How can I partition that into ext2? I have tried using sysinstall but somehow sysinstall cannot perform the operation that I wanted. (Check the post below)

How do I add an extended partition without deleting anything?