Raid 0 Striping on Inspirion 530

I am attempting to setup Raid 0 Striping on my dell Inspirion 530

I have updated the Bios to version 1.0.18

I have 2 Hard disk drives installed

A western digital WD2500AAJS-75VWA 250 GB harddrive

A Hitachi HDS7225SBSUN 250 GB Hard Drive

I have the SATA mode set to RAID under the Integrated Peripherals section

When i go into the INTEL matrix storage manager option rom v7.5.0.1017 ICH9R and select create raid volume i only have the option to vreate a raid1 Mirror array.

Both disks are visible in the bios and the Intel matrix bios.

What do I need to do to allow me to create a striped array?

Thanks