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When a bad block encountered on backup

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Can someone tell me how Acronis TrueImage Home 2010 handles the situation where files are being read from the disk during a backup and a bad block (unreadable) is encountered in the middle of a file?

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I would like to answer the also.

I can tell you some of my experience though. If you boot TIH from a CD and it encounters a bad block, the backup terminates. It happened to me last week so I ran the windows disk error checking windows option (no sector scan) and then the backup worked.
The second thing that happened was that I backed up all the files on my C drive via file backup. It gave bad block errors twice giving the sector #, but not the file name with the option to ignore, which I did. I ran the windows disk check with the option to do a sector check. Windows gave 2 errors, but I don't know what it did with the files. I tried to figure it out, but the windows message uses old DOS nomenclature of 8 characters file name and they were impossible to find. After that, I reran TIH file backup with no issues. One of the file was in the recycle bin so no issue. The other was in the SXS directory and I have no idea if it is gone or corrupted. It is possible that TIH did not back the files up after the first issue. No way to tell. I wish they were clearer as I have old backups and could have found the files.

When you run chkdsk /r, it will populate events in the event viewer (under different sections depending on your Windows version). It will create files fragments with the .CHK extension that will indicate whether some files have been damaged.
Other than that, Windows will have marked the sectors bad, won't use them again and you can ignore them in the backup.