Event ID: 55

So I'm getting this error in my system event log. No big deal accept this is on a 1.7TB volume that is in production. Not sure how long it will take to run chkdsk /f on this volume. This utility forces the volume to dismount kicking anyone off. Around here these people don't like when I have to take the server offline and I'm talking about after hours maintenance. I'll update when I run this util with how long it took.

Event Type: Error
Event Source: Ntfs
Event Category: Disk
Event ID: 55
Date: 10/24/2006
Time: 9:31:15 AM
User: N/A
Computer: **********
Description:
The file system structure on the disk is corrupt and unusable. Please run the chkdsk utility on the volume New Volume.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 00 00 04 00 02 00 52 00 ......R.
0008: 02 00 00 00 37 00 04 c0 ....7..À
0010: 00 00 00 00 02 01 00 c0 .......À
0018: 00 00 00 00 00 00 00 00 ........
0020: 00 00 00 00 00 00 00 00 ........
0028: c2 00 22 00 Â.".