Adding another drive to existing array without losing data (Raid 0)

I have a Dell PE2850 With a Raid 0 with a virtual drive 0 as follows:
Array Disk 1:0 33
Array Disk 1:1 33
Array Disk 1:2 68

In the Open Manage Array Manager in backplane 1 it shows
Array Disk 1:0 33
Array Disk 1:1 33
Array Disk 1:2 68
Array Disk 1:3 68

How can I add array disk 1:3 to the array or to a new array without
losing the vital data that I have on this drive? If this cannot be done can I assign the drive
as a non-raid drive and then be able to access the data on the drive?

OS is W2K3 Server Enterprise and a Perc 4 controller.