How to find which disk is faulty in a degraded RAID5 array? Then fix?

(I already posted a question in an old RAID thread, but I was told people who know the answers don't read old threads... And I checked the Sticky.)
My 4-disk RAID5 array (the K8N "PC1" machine) suddenly degraded today, and one disk is marked as faulty. The manuals aren't especially helpful in helping to find out which particular disk is faulty, and nothing is pointing out what kind of error it is, or what I should (safely) try...
Here's from the Event Viewer:
Quote
The description for Event ID ( 7 ) in Source ( nvraid ) cannot be found. The local computer may not have the necessary registry information or message DLL files to display messages from a remote computer. You may be able to use the /AUXSOURCE= flag to retrieve this description; see Help and Support for details. The following information is part of the event: .
From MediaShield:
nVidia reference boards have a "Disk Alert" utility showing the connector for the faulty disk, which seems like a good start (just follow the cable...). But it doesn't seem like the K8N has anything similar? That MediaShield picture doesn't at least make it 100% clear which of the disks is thrown out of the array.
Samsung has a DOS program that can test their disks, boot from a floppy I guess. I will download that and see if I can pin-point the disk. But if not, how? And if I find which one is marked faulty, how to find out if it's really faulty or if there is a "glitch" in the RAID routine?

<F10> at startup gets me into the MediaShield Utility, showing the degraded array.
It gives info about the three disks in the array, and the one removed:
Code: [Select]
Adapt Channel Index
1 0 0
1 1 1
2 0 2
2 1 3 This indicates that the disk marked faulty indeed also is the one connected to the SATA connector with the highest number.
So I guess I can try removing that disk and see if the machine still starts up, then temporarily put in a 500GB disk I have in an ESATA box (not containing anything useful). Then rebuild the array (for a couple of days?), then try testing the faulty-marked disk with the Samsung HUTIL program.

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