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Some disk sectors unreadable by Acronis

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While backing up my NTFS disk I get errors that say a particular area of the disk is unreadable.  I get this multiple times and SKIP over these.  I have run chkdsk multiple times and used other tools to inspect the disk but don't get errors by these other tools. 

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Did you run 

chkdsk /f /r - this will force a repair scan of the drive where regular chkdsk may not.  You may also want to try the free version of hard disk sentinel to see if it shows bad sectors as well.  

Also, from the Acronis GUI, in the advanced settings tab >>> error handling... there are options to ignore bad sectors and run in silent mode.  If you click these, it may skip the bad sectors and allow the backup to complete.  Just keep in mind if those bad sectors exist on critical Windows system files, the resulting image may have its own share of issues.