Acer Veriton 7600GT User Manual page 118

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Note: If your system currently boots to RAID and you delete the
RAID volume in the Intel RAID Option ROM, your system will
become unbootable.
Select option 2 Delete RAID Volume from the main menu window and
press <Enter> to select a RAID volume for deletion. The following
window will appear:
Select a volume and press <Del> to delete the RAID volume. The
following prompt appears:
Press <Y> to delete the selected volume.
Appendix C: RAID introduction (for R series model only)