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Windows 7: Bad Sectors on HD

01 Jul 2012   #1
NoelDP

Microsoft Community Contributor Award Recipient

Win 7 x64 Home Premium (and x86 VirtualBox VM)/Win10
 
 
Bad Sectors on HD

Packard Bell machine with original HD - ancient beast.
Owner is unemployed like me, so can't afford a new HD or machine.
Windows CHKDSK shows 52KB in bad sectors (my usual response - get a new HD)

Ran SeaTools For DOS - it found the expected 13 bad sectors and offered to repair them, so I said go ahead - said it had fixed them
Ran Seatools again, passed.

Back in WIndows, ran CHKDSK /R to clear the Windows bad sector tags - but it still shows 52KB in bad sectors.

Seatools is running again.
IF (big if) Seatools gives it the green light, is there any other way to clear the bad sector tags from Windows?


My System SpecsSystem Spec
.
01 Jul 2012   #2
TVeblen

Microsoft Community Contributor Award Recipient

Windows 7 64 Bit Home Premium SP1
 
 

Noel, did you try running CHKDSK /f and CHKDSK /b ?
That should clear the tags.

Chkdsk
My System SpecsSystem Spec
01 Jul 2012   #3
NoelDP

Microsoft Community Contributor Award Recipient

Win 7 x64 Home Premium (and x86 VirtualBox VM)/Win10
 
 

/R implies /F and /B


....or maybe not?
From that article, it looks like /b implies /r ??

Whatever,
My System SpecsSystem Spec
.

01 Jul 2012   #4
NoelDP

Microsoft Community Contributor Award Recipient

Win 7 x64 Home Premium (and x86 VirtualBox VM)/Win10
 
 

.... and I just realised/remembered that the machine is so old, it's XP - which doesn't have a /B option
My System SpecsSystem Spec
01 Jul 2012   #5
Golden
Microsoft MVP

Windows 7 Ult. x64
 
 

Noel,

I stumbled across this a few months ago, and have been meaning to test it, but haven't gotten around to it - a utiltiy to repair bad sectors. So I can't say that this will work, so consider with caution.

HDAT2/CBL Hard Disk Repair Utility

Click on the description link.

Have you examined the disk using a live Linux boot CD? Debian 6 has nifty tools for checking disks.

UK Mirror Service: sites/cdimage.debian.org/debian-cd

Regards,
Golden
My System SpecsSystem Spec
01 Jul 2012   #6
TVeblen

Microsoft Community Contributor Award Recipient

Windows 7 64 Bit Home Premium SP1
 
 

In the past I had read that Chkdsk keeps it's 'bad sector list' on a particular HDD forever, or until CHKDSK says they are clear. I would have thought that had changed by now.

If running chkdsk /f by itself does not clear the list then the only other solution I know about is a true low level format of the disk.
Hardly seems worth it for a few bad sectors, particularly if Seatools says it is good.
My System SpecsSystem Spec
01 Jul 2012   #7
NoelDP

Microsoft Community Contributor Award Recipient

Win 7 x64 Home Premium (and x86 VirtualBox VM)/Win10
 
 

Thanks, Golden - the utility you linked to is only for FAT drives, and this is NTFS so it wouldn't work.

The Windows Bad Sector count is held in the MFT - not on the disk itself - which is why the /B switch works in Vista and Win7.
The way it works is - I gather, perhaps wrongly.....
1) Windows has a problem reading a sector (usually an ECC error) so it tells the Disk firmware that there's a problem. The firmware then retries the read.
2) After so many attempts, Windows gives up, and tags the sector in the MFT as bad, and then instructs the firmware to do the same on the HD.
3) Along comes the manufacturer's utility, and that can't see any problem with the sector on the physical read, so it unmarks it as a bad sector.
4) Windows still has the sector marked as bad in the MFT so ignores it totally, and still shows it in a CHKDSK report.


Note that this only applies to software failure (possibly caused by power spike/drop during read), NOT a hardware fail, such as a dust particle on the disk blocking reads (you can sometimes tell this, if a number of contiguous sectors are failing, and refuse repair by the utility)


The /B switch in Vista/Win7 clears the MFT table so that the implied /R can retest the sector readability, and /F can retest the data.
In theory, a simple reformat will clear a software bad sector, providing the firmware sectors have been reset first.

However - I made the mistake on this machine of not running the CHKDSK until after reinstalling, updating and installing the required programs. I do NOT want to have to do that again in a hurry!
...and if I clone the drive, it will clone the problem.
My System SpecsSystem Spec
01 Jul 2012   #8
NoelDP

Microsoft Community Contributor Award Recipient

Win 7 x64 Home Premium (and x86 VirtualBox VM)/Win10
 
 

Quote   Quote: Originally Posted by NoelDP View Post
4) Windows still has the sector marked as bad in the MFT so ignores it totally, and still shows it in a CHKDSK report.

re-reading that, it makes me wonder if perhaps SeaTools for Windows has the ability to do teh necessary??

Back soon!
My System SpecsSystem Spec
01 Jul 2012   #9
TVeblen

Microsoft Community Contributor Award Recipient

Windows 7 64 Bit Home Premium SP1
 
 

That is my understanding also.

I'm not sure if a simple format will clear the list. I have always used Diskpart Clean All to "low level format" (antiquated term, I know, can't help it!) in these cases with good success.

I'm not sure that cloning (imaging) a disk will copy bad sectors. Isn't it just raw data that is copied?
My System SpecsSystem Spec
01 Jul 2012   #10
TVeblen

Microsoft Community Contributor Award Recipient

Windows 7 64 Bit Home Premium SP1
 
 

Quote   Quote: Originally Posted by NoelDP View Post
Quote   Quote: Originally Posted by NoelDP View Post
4) Windows still has the sector marked as bad in the MFT so ignores it totally, and still shows it in a CHKDSK report.

re-reading that, it makes me wonder if perhaps SeaTools for Windows has the ability to do teh necessary??

Back soon!
It would be good to know. Carry on!
My System SpecsSystem Spec
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