Canceled chkdsk /r, after ran 5~10 mins cause of doubt to data loss.

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Alphabit

Commendable
Jun 9, 2016
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1,510
I found some bad sectors on hdd drive by hdd bad sector scan program.

So i ran chkdsk /r on this drive and canceled when 5~10 mins later because i heard chkdsk /r can data loss.

This is last status when i saw chkdsk window.

Stage 4: Looking for bad clusters in user file data ...
Progress: 5187 of 94936 done; Stage: 0%; Total: 0%; ETA: 13:34:13

There is no any error messages or notice of problem in Stage 1~3. it passed all successfully.

After cancel chkdsk, i successfully finished back up data to another hdd, except just one file could not copied, so i deleted this folder (i guess this was data on bad sector).

So i want to make sure about this situation. chkdsk didn't notice any report about errors or corruption while running. but i am worried if some data loss is possible with this situation. please help, thanks.
 
Solution
D_Know_WD
Well, chkdsk checks data integrity. If there was a bad sector, there is a chance that it was reallocated and there is no corrupted data.
On the other hand, the tools that provide SMART status check the physical condition of the HDD. This is why they tend to be more accurate when it comes to a drive's health.

Cheers,
D_Know_WD :)
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Eximo

Eximo

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May 27, 2010
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Well if chkdsk finds bad data the /r command will attempt to read, use parity to guess the missing data, then move it to a working part of the drive. Anything lost is already lost and running chkdsk will just uncover the problem.

I'm glad you've taken the step to back up everything now. You could check the SMART logs of the drive to see if there is a long term problem, or if you just happened to have a few bad sectors. If the drive isn't significantly smaller then it used to be and the SMART logs don't show too many issues the drive probably has some life left.

Though I am paranoid and would just go out and get a new drive.
 
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D_Know_WD

D_Know_WD

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Jul 30, 2014
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Hi there Alphabit,

It's great that you've backed up the important data.

As Eximo suggested, you need to observe the SMART report. You can test the drive with some of these: http://www.tomshardware.co.uk/forum/282651-32-best-diagnostic-testing-utility

See if there are any abnormal values. Look for pending/reallocated and uncorrectable sectors. If there are some, then the drive is considered to be unreliable.
The thing with bad sectors is that they can't really be repaired. They will eventually continue to appear until the drive fails. So, my suggestion would be to use it for storing non crucial data.

Let us know how this goes,
D_Know_WD :)
 
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Alphabit

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Jun 9, 2016
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Thank you for your answer. i already got new drive, so one thing i wanna make sure is, when chkdsk checking disk and didn't notice any error messages with status window while i running it, there are non data loss. right?
 
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A

Alphabit

Commendable
Jun 9, 2016
5
0
1,510


Thank you for the answer, i already checked SMART and there are bad sectors counted, so i changed to new drive.
 
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A

Alphabit

Commendable
Jun 9, 2016
5
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1,510
I just want to make one thing to sure. when chkdsk checking disk and didn't notice any error messages with status window while i running it, there are no data changed or fixed or removed, is this clear?
 
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D_Know_WD

D_Know_WD

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Jul 30, 2014
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Well, chkdsk checks data integrity. If there was a bad sector, there is a chance that it was reallocated and there is no corrupted data.
On the other hand, the tools that provide SMART status check the physical condition of the HDD. This is why they tend to be more accurate when it comes to a drive's health.

Cheers,
D_Know_WD :)
 
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