2 different drives on my RAID connectors?

I think I've seen this asked before, but can't remember the answer or find the thread, so I have to ask again:
I have an MSI 845 Ultra MS6398 with RAID connecters IDE3 and IDE4. I have hooked a 40gig Maxtor hard drive on IDE3 in a 1+0 array and it works fine. What I'd like to do is add an 80gig hard drive on IDE4 with completely different data on it. Is this possible, or advisable? If so, how do you make it happen?
Earl

Thanks. Toward the bottom of his write-up he says:
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
To add more hard drives to either IDE-3 or IDE-4, you may repeat the steps from No. 5, ONE DRIVE AT A TIME, it's crucial to make sure the RAID BIOS detects each drive, set each drive as single disc array and NOT to mix with other existing arrays.
If any comments, problems and suggestions, feel free to post follow-up here.
with best regards,
Maesus
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX X
that "set each drive as single disc array and NOT to mix with other existing arrays"
is not crystal clear, but hopefully I can just follow my nose.
Earl

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