Drive Management - Drive at Risk

My customer has an Adaptec Raid controller 2110s. He has 4 SCSI disks connected to it. In XP if I go into disk management it shows on of the disks as Healthy (At Risk). I have been searching for more information on this possible error. Does anyone know what this means? Should I replace this drive? If I right click on it I get the option to reconnect to it but have not taken that step until I can get a good backup.

Also connected to the raid are two other SCSI hard drives that are supposed to be mirroring the main drives. These drives show up in the raid boot setup page but do not show up in windows. Is this a sign they may not be working or does windows just not see mirror drives? I am thinking they should show up but I am not sure about that.
Chris_McMahonAsked:
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Aland CoonsConnect With a Mentor Systems EngineerCommented:
The Healthy (At Risk) status occurs when a dynamic volume is experiencing I/O errors caused by bad sectors on the physical disk. The disk remaps the bad sectors by using sectors reserved exclusively for remapping. If the errors are transient, you can use the Reactivate Disk command in Disk Management to return the volume to the Healthy status. If the At Risk status persists, your disk might be failing. Back up the data and replace the disk as soon as possible.

For more information:
http://www.microsoft.com/resources/documentation/Windows/XP/all/reskit/en-us/Default.asp?url=/resources/documentation/Windows/XP/all/reskit/en-us/prkd_tro_jqjy.asp

If the SCSI drives are being mirrored by a RAID controller they will not show up in windows.  Windows Server has mirroring functionality built in that doesn't require the use of a RAID controller. You can't setup OS based mirroring with anything but Server verisons of Windows.

http://support.microsoft.com/default.aspx?scid=kb;EN-US;314343
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