[all variants] Hard drives and RAID - How is it set up?

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http://ubuntuforums.org – Got a RAID question. My PC has 2 identical 500gb HDs. My BIOS setup does not show anything related to RAID, I've checked every entry, every option, yet the 9.10 installer "sees" RAID. So, is my hardware physically set up as RAID? How can I check? I'd like to have it as 2 separate drives, and screw RAID. What do I do? (Hardware)