IIRC, just a normal part of repairing the volume, not the disk. I have eleven volumes on my int HD and get that with every repair action.27" i7 iMac SL, Lion, OS X Mountain Lion (10.8.2), G4 450 MP w/Leopard, 9.2.2
When you get the report. Quit DU and go forward. This is what I just got with one named TestVolume:
Verify and Repair volume “TestVolume”
Checking Journaled HFS Plus volume.
Checking extents overflow file.
Checking catalog file.
Checking multi-linked files.
Checking catalog hierarchy.
Checking extended attributes file.
Checking volume bitmap.
Checking volume information.
The volume TestVolume appears to be OK.
Volume repair complete.
Updating boot support partitions for the volume as required.27" i7 iMac SL, Lion, OS X Mountain Lion (10.8.2), G4 450 MP w/Leopard, 9.2.2