Maintenance :: Windows 8 / New Chkdsk And Drive Activity After Scan

Feb 24, 2014

I have some questions regarding the new Chkdsk in Windows 8 (I'm using Windows 8.1 Pro 64bit).

note that Windows 8's Chkdsk has changed considerably since the previous Windows versions; so if you know about the Chkdsk in Windows 7 or previous Windows versions, this could not apply to the Chkdsk in Windows 8.

I also point out that I'm talking about the GUI version, accessible from the drive's properties Window.

My main questions are: when Chkdsk has finished scanning, and the results window appears, can I at once proceed with the following, or should I wait some time:

1) In case of an external USB drive, disconnect the hard drive (with "safely remove hardware", even if the cache is turned off), and turn it off.

2) In case of an internal drive (HDD or SSD), reboot Windows, or turn off the computer.

My worry is that if I would disconnect a USB drive, or reboot or turn off the PC in case of an internal drive, before the Chkdsk-related activity is finished, then the file-system of the disk in question could get damaged.

My doubts come from the following facts:

- I have been told that when the Chkdsk results window appears, this means that Chkdsk has finished working with that drive; but I have noticed that some short drive activity is happening some seconds (about 6) after the results window appears (should be a write activity, not sure if also read activity). I noticed this by observing the LED on my USB drives, and also by monitoring the drives in question with Windows 8's new Taskmanager.

- In case of disconnecting USB drives, I have been told that I can be sure that if some drive activity is happening, then the "safely remove hardware" feature won't have effect, and would warn me that there is disk access going on; but I have tried to select "safely remove hardware" while Chkdsk was in the middle of a scan, and the result was that Chkdsk got interrupted (with an error messsage appearing probably from Chkdsk), and the USB hard drive got removed. Though this seems not to have caused any file-system errors (I did another Chkdsk scan later).

You may think that I just need to look at the drive's LED, or monitor the drive's activity with the new Taskmanager, and take note of after how much time the drive activity ceases. Then I would just need to wait so long before disconnecting the USB drive, or rebooting or turning off the PC.

My problem here is that I'm not sure if the new Taskmanager, or the drive's LED, are sensible enough to detect even the smallest disk access, which could get unnoticed. I'm not sure how much I should wait... seconds? Minutes? What do you think? Perhaps there's no need to wait at all?

I did some tests by disconnecting (with "safely remove hardware") a USB drive shortly after doing a Chkdsk on it. Then I did another Chkdsk after turning it on again. I didn't get any error message from Chkdsk. But I'm still worried that there could be an unfortunate moment, during which a disconnection (still with "safely remove hardware") could cause problems, perhaps because in that moment a write operation could be in process.

I think I have read that the new Chkdsk in Windows 8 uses VSS ("Shadow Copy") to check the drives while keeping them online. With this new Chkdsk, I think it is possible to continue using the drive while the scan is happening, even on the system drive.

I was thinking about this: is it possible that the short activity which I have noticed after Chkdsk's results window appears, comes from this Shadow Copy Service, which is "unmounting" (?) the shadow copy used by Chkdsk?

If this is true, is it important to let the "unmounting" task happen, or can I disconnect, reboot, or turn off before it starts? And what happens if I interrupt this "unmounting" task in the middle, while it is in process?

Does it make some sense to wait some time after doing a Chkdsk, or can I at once proceed to disconnect the USB drive, or reboot or turn off the PC (in case of internal drives)?

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Today I've tried doing a Chkdsk scan on my primary drive. Through the console, I entered this line to start the process on a re-boot 'chkdsk /f /r c:'.

I afterwards left it to do it's work for the next 1 and half hours '6:40-8:10pm', during this time I went to check on the progress of the scan and what I saw was that it was only '10%' into completion, this confused me greatly as previous computers that I have owned would atleast be around 70, or 80% percent completed, so not knowing what to do, I did a cold-boot.

From what I can tell, no visible damage has afflicted said the drive I did the chkdsk scan process on, but I would still very much like to know why my scan is hanging.

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So, to get to the main point... I figured it wouldn't hurt to run a disk check, in case there were any other errors or problems. I knew it would take a while, so I opened command prompt, and typed in "chkdsk C: /r", before hitting enter, letting it schedule the disk check for next startup, rebooting the PC, and then leaving it to do its thing. It's been running probably for about 4 or so hours now, and for most of that time it's been at 27% on "Scanning and repairing drive (C:)". Normally I'd just give in and force shut down at this point, but I'm wondering... what's the best course of action if it doesn't get anywhere with this?

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Apr 8, 2014

Delay Chkdsk start up time at OS Boot | Windows 8 & 8.1 (Or Disable Altogether)

Previous to Windows 8 if Chkdsk needed to run without prompt the user had the ability to cancel if so desired. Since Windows 8, the user input has been removed.

At the least, you can change the delay setting as follows:

Modify DWORD "AutoChkTimeout"

IMAGE ONE:

1. Open Regedit:
One way to open regedit is to hit the Winkey+S and type regedit, hit enter when you see it appear.

2. Navigate to the following registry key:

Code: HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlSession Manager 3. Click on the folder "Session Manager"

4. In the right hand pane you will see registry values. Right click on the value "AutoChkTimeout" and select "Modify" (See image one)
If the value is missing, create it (See image two)

5. Change the "Value data:" to the desired delay time of your choice.
e.x. Changing the value to 10, will delay the Chkdsk start time by 10 seconds.
Click OK, close the registry.
Finished.

Create DWORD "AutoChkTimeout"

IMAGE TWO:

If the registry value "AutoChkTimeout" is not present:
Right click on an empty space in the right hand pain (in folder "Session Manager")

Select "New"
Select "DWORD (32-Bit) Value
Name it "AutoChkTimeout" (No Quotation Marks "")
Follow step 4. above.

Remember:
Name = AutoChkTimeout
Base = Hexadecimal
Value Data = Delaytime (in seconds)

DISABLE automatic repair in Windows 8 & Windows 8.1

If you would like to disable automatic repair altogether:

1. Open the command prompt as Administrator (an elevated instance). If you have no idea how to open an elevated command prompt. Hit Winkey+S type in cmd.exe, when it appears, right click on the name and choose "Run as administrator"

2. Type the following text into the cmd window

Code: bcdedit /set recoveryenabled NO

You have now disabled the Automatic repair function.
To reinable: Follow step 1 and in step 2 type in the following text:

Code: bcdedit /set recoveryenabled YES

Having disabled the Automatic repair feature, you can follow Brink's tutorial on manually running Chkdsk > Here:
CHKDSK - Check a Drive for Errors in Windows 8

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I have read that Windows 8 has a new Chkdsk, which checks the file-system integrity in background. I'm using Windows 8 Pro 64bit (and NTFS file-system on all drives).

Does this improved Chkdsk check the file-system just when the computer is not used, or does it check it also while the user is working? Or does it scan the drives just when it's maintenance time?

Does it still make sense to run a manual Chkdsk on some occasions, or can I just not worry and let Chkdsk do its checks automatically? Such occasions would be for example after the computer completely hangs and I have it to brutally turn it off with the power switch (happened lately with a Linux live-CD), or after problems with the electric line (loss of power/power outage, resulting in instant turning-off).

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[URL]

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[URL]

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