Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I have four drives on my computer. The problem is that each time I start the computer the scan disk check (CHKDSK) runs for a drive even if I shut down my computer properly. I ran the thorough scan disk check but still for that drive, the scan disk check is always performed no matter what.

I wonder what is wrong although everything is fine and accessible along with drive data. Could you guys please help me out of this?

I am using Windows XP SP2


With reply to comment below, the setting for the registry key:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\
Session Manager\BootExecute

is set to:

chkvdisk autocheck autochk *

And I am not sure what does it mean, is this same in your case too? What is the default value for that registry key?

As for chkdsk /f, I get the following message:

Chkdsk cannot run because the volume is in use by another
process.  Chkdsk may run if this volume is dismounted first.
Would you like to force a dismount on this volume? (Y/N)

I am not sure what it means especially the line ALL OPENED HANDLES TO THIS VOLUME WOULD THEN BE INVALID.. So, I am afraid and I do not run chkdsk/f because of data loss, etc.

Please Help


share|improve this question
What do you have set here HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\Session Manager\BootExecute? – Ximon May 31 '10 at 0:46
@DwightSampsonite: Well, it is set to chkvdisk autocheck autochk * – Sarfraz May 31 '10 at 21:23
You mean check disk and not scan disk right? Scan disk was the Win 9x tool for FAT volumes. – MDMarra Jun 11 '10 at 3:49
@MarkM: I mean CHKDSK and problem drive is ntfs. Other drives are also ntfs but there is no problem with them. – Sarfraz Jun 11 '10 at 18:02
up vote 1 down vote accepted

On a vanilla XP, the value of the BootExecute registry key is:

autocheck autochk *

The file chkvdisk in your registry entry is, according to the article Chkvdisk not found, part of the RollBack Rx product, which is an instant PC recovery software.

If you have RollBack Rx installed, it might explain why the hard disk is in constant use.
Let me know if this is the case.


The RollBack Rx knowledge-base contains this article:
Rollback is causing a repetitive CHKDSK

After announcing that a CHKDSK problem is impossible, the article does actually explain how it can happen. I personally find the following paragraphs to be really frightening:

Rollback Rx ... rather than copy the data somewhere else, declares the hard drive Sectors where the data is currently located as “protected”. It subsequently redirects any attempts to change that sector. It does this by attaching a “filter” to the Windows driver.

So, for example, if WFM (Windows File Manager?) wants to write to sector 100, Rollback detects the write, determines that a snapshot protects sector 100, and redirects the write to an open sector (say, 200) and creates a reference in its own Disk Map. Any subsequent read to Sector 100 is also redirected to Sector 200.

Alternately, a hard power loss just at the very microsecond that Rollback is flushing its Disk Map from memory to disk can cause a Disk Map Error as well as, very likely, a CHKDSK. In this case, the CHKDSK run will conclude successfully, but this does not fix the Rollback Disk Map anomaly, because the Map is invisible to Windows.

Conclusion: RollBack Rx becomes your disk manager, rather than Windows.
In fact, Windows has no idea what's happening to its own hard disk.

The above article contains a section titled "Find and Fix Snapshot Problems", that's supposed to fix these same problems that the same article previously denounced as urban myths. Not having RollBack Rx installed on my computer, I have no way of verifying whether they really work, but you certainly won't find anything better.

All I can remark as regarding installing RollBack Rx on my own computer is :
Over my dead body!

share|improve this answer
@harrymc: That's the exactly the case, I have rollback installed but this problem has never happened before with it and i wonder how to do away with it. – Sarfraz Jun 11 '10 at 18:04
@Sarfraz Ahmed: See my edit above. – harrymc Jun 11 '10 at 18:43

Probably the dirty flag is not being cleaned. try running chkdsk /f from command prompt.

share|improve this answer
You should probably use /r instead of /f in this case, so that bad blocks will also be discovered. /r implies /f – MDMarra Jun 11 '10 at 3:50

What happens if you run chkdsk from the recovery console, when there won't possibly be any other processes trying to interfere with it? You may also want to do a full hard drive test with some sort of diagnostic software... if the hard drive is repeatedly being marked dirty, it may be on the verge of failing, in which case you'll want to replace it asap.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.