[CentOS] Dell R605 w/ Perc 6/i problem

I think there was just a thread 'bout this, and I didn't pay attention... and then I walked into our smallest server room to rebuild a server with CentOS... and that's what it is. The problem I'm having is this: there are two 1T SAS drives, raided, via the controller. There's also a 750G SATA drive. The Dell test suite sees it, and reports that SMART says it's fine. However, no matter what I do, the BIOS doesn't see it, and when I boot to linux text, fdisk only sees the raided 1t.

Clues for the poor? I want to put the system on the SATA drive, leaving the raid for data.

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