ASROCK 939S56-M Manual page 11

7. If the operation is "Split data into Raid0", a warning message will pop
up. See below:
Next, you may click Yes button to start the operation
or click No button to cancel.
When this operation is beginning, you still can click
the destroy button on the "Create Stripe RaidSet"
dialog to stop this operation. But this action will
cause the data of the source disk broken. And
the following message will be popup to remind you.