Ntfs log error

I am getting the following error in my logs:

The file system structure on the disk is corrupt and unusable. Please run the chkdsk utility on the volume \Device\HarddiskVolume2.

I am not completely certain which volume the error is referring to. Here is the output from diskpart:

DISKPART> list disk

  Disk ###  Status      Size     Free     Dyn  Gpt
  --------  ----------  -------  -------  ---  ---
  Disk 0    Online       931 GB      0 B
  Disk 1    Online       932 GB      0 B
  Disk 2    Online       932 GB    17 MB
  Disk 3    Online       932 GB      0 B

DISKPART> list volume

  Volume ###  Ltr  Label        Fs     Type        Size     Status     Info
  ----------  ---  -----------  -----  ----------  -------  ---------  --------
  Volume 0     E                       DVD-ROM         0 B  No Media
  Volume 1     C                NTFS   Partition    159 GB  Healthy    System
  Volume 2     D                NTFS   Partition    771 GB  Healthy
  Volume 3     X   BACKUP01     NTFS   Partition    932 GB  Healthy
  Volume 4         SBS_Backup   NTFS   Partition    931 GB  Healthy
  Volume 5     F   Monthly Arc  NTFS   Partition    932 GB  Healthy

Physically Volumes C: and D: are partitions on the internal 3 drive RAID 5 array.
Drive X is an external USB drive which is used by the SBS backup exclusively
Drive E is an External USB used for flat file backup
Drive F is an External USB used for archive purposes.

The internal SBS backup has failed the last few days giving a drive related error but the diskpart output makes it look to me like the log entry is referring to  the D: partion (where all our data is). We have not noted any problems accessing or writing to files on the server.

So my question is which drive/partition is the error referring to and how do I go about fixing it. Also what are the risks associated with  running chkdsk on a RAID and are there precautions I should take. Thanks

This stuff scares the crap out of me.........
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Are you positive that all drives in the array are functioning correctly?  You'll need to install the RAID management software from your server manufacturer to check this.  Possibly one is dying.

In regards to CHKDSK....

I believe you would be fine in running a chkdsk on any and all of the USB drives.

Chkdsk is a Windows utility that uses simple algorithms to recover data from a corrupt disk. Chkdsk can be started by the user or automatically by Windows if it detects disk corruption at boot time. (Windows will ask for confirmation before starting chkdsk but will start it anyway if no response is received after a number of seconds.) Chkdsk is not RAID-aware. Its algorithms only work in the simplest cases. In general, it must be avoided.

If chkdsk attempts to repair one or more member disks, the RAID data patterns will be destroyed, usually beyond recovery.

Here's Microsoft's response...

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Please ***NOTE*** that some USB drives are actually two drives STRIPED in a RAID0.   I would only run CHKDSK on a single drive.
pmckenna11Author Commented:
Thanks for the chkdisk warning about RAID. I thought I remembered there being an issue. I am still at a loss as to which partition is at fault. I already used the Dell Admin utility to check the drives and they all show healthy. Also the mmc plugin shows all the drives as healthy.
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pmckenna11Author Commented:
Just for a little more info. I have a another thread going regarding a problem with VSS and Windows backup. I now think all of these problems may be related. I restarted the VSS service and then tried to run the SBS backup. I got this error (first time it has ever shown up)

The file system structure on the disk is corrupt and unusable. Please run the chkdsk utility on the volume \Device\HarddiskVolumeShadowCopy228.

So now what? Is it possible that all these errors are coming from the dedicated USB drive which is used by SBS backup? This server is for an accounting firm. You can imagine what a disaster it would be for it to crash before April 15th! I am trying to head off a catastrophe.......
Volume Shadow Copy creates a hidden space on either the C: or D: partitions (depending on how its set)
1. Right-click Local Disk C:\
2. Properties
3. Select the ShadowCopies folder

Your Backup software would create the same type of hidden volume.

Possibly this hidden location is corrupt, because the partition on which it resides is ALSO corrupt.

VSS needs drives -- drives are corrupt -- VSS is corrupted
pmckenna11Author Commented:
Shadow Copies is disabled for all drives when I look under properties. Also when I check the Dell Management console there is no indication of trouble with the drives. I am not sure at what level that check is made (SMART?) but they show up as healthy. So assuming the one of the drives is corrupt where do I go from here?

Also no one has been able to tell me for sure which partition  \Device\HarddiskVolume2 is. Any takers?

Thanks for the help so far
Maybe this is your issue: http://support.microsoft.com/kb/932578

It seems to be worth a shot.
Another ***NOTE***

running chkdsk mentioned in the KB article will execute CHKDSK in read-only mode -- which should be safe.
pmckenna11Author Commented:
Problem is  not yet solved but I am closing the question. I will be reposting in a different thread where I can add more info
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