Dell Precision 490 - Manual (Page 30)

Deleting a RAID Volume
1. Press <Ctrl><i> when you are prompted to enter the Intel RAID Option ROM utility.
2. Use the up- and down-arrow keys to highlight Delete RAID Volume, and press <Enter>.
3. Use the up- and down-arrow keys to highlight the RAID volume you want to delete, and press <Delete>.
4. Press <y> to confirm the deletion of the RAID volume.
5. Press <Esc> to exit the Intel RAID Option ROM utility.
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NOTICE: When you perform this operation, all data on the RAID drives will be lost.
NOTICE: If your computer currently boots to RAID and you delete the RAID volume in the Intel RAID Option ROM utility, your computer will become
unbootable.