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From: Olivier Nicole <on@cs.ait.ac.th>
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> I have two SATA disks configured for mirroring in the BIOS; I see the 
> two disks separately as ad devices, but no RAID device: I'd expect an 
> ar0 or something.

I think that if it is hardware RAID, you should see only one disk.

If it is not supported, you will not have access to the RAID error
diagnostics in FreeBSD, but it should still appear as one single disk.

Bests,

olivier