AXIOMTEK IMB530 User Manual page 78

Delete RAID volume
If you want to delete a RAID volume, select the "Delete RAID Volume" option in the Main Menu.
Press <Enter> and follow on-screen instructions.
Press <Esc> to exit the RAID BIOS utility. Now, you can proceed to install a SATA driver
controller and the operating system.
78 Configuring SATA for RAID