RAID 10 Drive Failure, questions

I'm running four 1TB Seagate drives in RAID10 using my mobo's hardware RAID drivers. For a few days, everything worked fine, but now it's saying disk four has a critical failure during startup. I've run Seatools to find the bad disk, but all four go through the long test w/o issue.

I can still RMA the drives, but the issue is knowing which one is causing the problem. How can I find this out?

Also, if I send in one, am I still able to run the RAID without that fourth drive connected while I wait for the replacement?

Not sure how much of this is needed, but here's the mobo and hdd specs:
Motherboard: DFI LANParty DK 790FXB-M3H5 (http://www.newegg.com/Product/Product.aspx?Item=N82E16813136067)
HDD: 4x Seagate Barracuda 7200.12 ST31000528AS 1TB (http://www.newegg.com/Product/Product.aspx?Item=N82E16822148433)
OS: Windows 7 Home Premium x64
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More about raid drive failure questions
  1. Go into the RAID setup during boot. View LD setup. It will tell you which Sata port the defective drive is on. Unhook this drive.

    After that, I have no idea.
  2. these drives support raid 0+1 not raid 10 (0+1).
    I'm having same problem on extreme rapage asus motherboard, highend server just built w/ icore 7; 12g ram- window7-64 (highend system).
    Mwave built it configured four drives on Raid 10.

    Went to seagates online spect. an indicates these drives supports raid 0+1.
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