When you run ChkDsk without taking a volume offline, the results are NOT accurate.
You can use the Vrfydsk.exe tool to check the integrity and consistency of a specified volume.
NOTE: Vrfydsk.exe cannot fix any errors it reports. To fix any errors, use ChkDsk.exe with the /F or /R switch.
When you type Vrfydsk /?, you see:
VRFYDSK \[volume\[path\]\] \[/V\] \[/I\] \[/C\]
volume Specifies the drive letter (followed by a colon),
mount point, or volume name.
/V On NTFS: Displays cleanup messages if any.
/I NTFS only: Performs a less vigorous check of index entries.
/C NTFS only: Skips checking of cycles within the folder
The /I or /C switch reduces the amount of time required to run Chkdsk by
skipping certain checks of the volume.
1. Open a CMD.EXE window.
2. Type vrfydsk C: /V and press Enter.
NOTE: Vrfydsk.exe uses the Volume Shadow Copy service to create a temporary reduced shadow copy of the volume, which it checks.