Migration Raid

I have HP ML-370 G3 server included Smart Array 642.

I have installed new 72GB drive. I want Drive migrate RAID 0 to RAID 0+1. I did the follw.

Launch array configuration utilities 7.30 and I see the 72GB parallel scsi unassigned drive at port 2

select configuration wizard
select migration a logical drive
select begin
select logical drive 1 (20500 MB, RAID 0)
select next

here I see only RAID 0 selection.

where is the wrong?. kindly help me