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  • Marked bad sectors in hard drive

    I ran chkdsk /f /r and it found some bad sectors on one of my hard drives. Once these sectors are marked are they completely hidden from future scans. The reason I ask is I want to replace the drive that had the bad sectors but I don't remember which one it was.

  • #2
    Re: Marked bad sectors in hard drive

    if you just run chkdsk on the suspected disk, won't it show a summary with the amount of bad blocks?
    Marcel
    Technical Consultant
    Netherlands
    http://www.phetios.com
    http://blog.nessus.nl

    MCITP(EA, SA), MCSA/E 2003:Security, CCNA, SNAF, DCUCI, CCSA/E/E+ (R60), VCP4/5, NCDA, NCIE - SAN, NCIE - BR, EMCPE
    "No matter how secure, there is always the human factor."

    "Enjoy life today, tomorrow may never come."
    "If you're going through hell, keep going. ~Winston Churchill"

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    • #3
      Re: Marked bad sectors in hard drive

      That's what I was wondering. Does it just show new bad blocks or does it also include blocks found in previous scans? It takes about 8 hours to scan the entire drive and I won't have time to scan it until this weekend.

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      • #4
        Re: Marked bad sectors in hard drive

        There's a few ways bad sectors are tracked. One by the MFT and that is how chkdsk marks bad sectors.

        The other is by the drive itself and is completely opaque to OS and any software. I don't thing even SMART reveals this information. If the drives's firmware detects a bad sector it will swap that sector with one of the reserved sectors it has. When the drive does it the OS and any other software has no knowledge of this change and still sees the data in the exact same place.

        So bottom line, if you want to see what drive has sectors marked as bad by chkdsk then you have to read the MFT. Bad sectors are marked with 0xFF.
        Regards,
        Jeremy

        Network Consultant/Engineer
        Baltimore - Washington area and beyond
        www.gma-cpa.com

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        • #5
          Re: Marked bad sectors in hard drive

          Download the trial version of HD Tune Pro and run that. http://www.hdtune.com/download.html

          If you have a HDD and you detect bad sectors, the best thing you can do is backup any data then throw drive away because the odds are the bad sectors are only going to get worse.
          1 1 was a racehorse.
          2 2 was 1 2.
          1 1 1 1 race 1 day,
          2 2 1 1 2

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          • #6
            Re: Marked bad sectors in hard drive

            Originally posted by biggles77 View Post

            If you have a HDD and you detect bad sectors, the best thing you can do is backup any data then throw drive away because the odds are the bad sectors are only going to get worse.
            Remembering to scrub the drive multiple times first and apply one or more permanent fixes to prevent data recovery:
            http://www.pcpro.co.uk/blogs/2009/08...ction-methods/
            Tom Jones
            MCT, MCSE (2000:Security & 2003), MCSA:Security & Messaging, MCDBA, MCDST, MCITP(EA, EMA, SA, EDA, ES, CS), MCTS, MCP, Sec+
            PhD, MSc, FIAP, MIITT
            IT Trainer / Consultant
            Ossian Ltd
            Scotland

            ** Remember to give credit where credit is due and leave reputation points where appropriate **

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            • #7
              Re: Marked bad sectors in hard drive

              Originally posted by Ossian View Post
              Remembering to scrub the drive multiple times first and apply one or more permanent fixes to prevent data recovery:
              http://www.pcpro.co.uk/blogs/2009/08...ction-methods/
              Sledgehammer also works wonders.
              1 1 was a racehorse.
              2 2 was 1 2.
              1 1 1 1 race 1 day,
              2 2 1 1 2

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              • #8
                Re: Marked bad sectors in hard drive

                But Rule 303 works better
                Tom Jones
                MCT, MCSE (2000:Security & 2003), MCSA:Security & Messaging, MCDBA, MCDST, MCITP(EA, EMA, SA, EDA, ES, CS), MCTS, MCP, Sec+
                PhD, MSc, FIAP, MIITT
                IT Trainer / Consultant
                Ossian Ltd
                Scotland

                ** Remember to give credit where credit is due and leave reputation points where appropriate **

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                • #9
                  Re: Marked bad sectors in hard drive

                  Originally posted by biggles77 View Post
                  Sledgehammer also works wonders.
                  We strip the drives down, score the surface with a knife and then use them as coffee coasters. They look very nice.
                  BSc, MCSA: Server 2008, MCSE, MCSA: Messaging, MCTS
                  sigpic
                  Cruachan's Blog

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                  • #10
                    Re: Marked bad sectors in hard drive

                    you mention chkdsk /r /f takes 8 hours to run.

                    just run a simple, online chkdsk.
                    This will finish much quicker. Schedule it to start at 8pm at night, it'll be done by the time you get in tomorrow morning, without needing to reboot the server.
                    Please do show your appreciation to those who assist you by leaving Rep Point https://www.petri.com/forums/core/im.../icon_beer.gif

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