Dell Precision T5400 (Late 2007) - Manual (Page 64)

64 Advanced Features
Deleting a RAID Volume
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.
1 Press 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 .
3 Use the up- and down-arrow keys to highlight the RAID volume you want
to delete, and press .
4 Press to confirm the deletion of the RAID volume.
5 Press to exit the Intel RAID Option ROM utility.