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).

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

Please help, thanks.

Yes, if it didn´t report any error, or messages about fixing something, then it should not have changed data.

If now you have already backed up all important data, you can run a full verification, either with MHDD or the HDD maker test program, to try to identify and remap bad sectors. Please remember that, in case of too many bad sectors, the hdd is probably not safe for use anymore .