Invalid BS_jmpBoot in boot block.... What is that?

Discussion in 'macOS' started by raptorsoft2000, Apr 26, 2011.

  1. raptorsoft2000 macrumors newbie

    Joined:
    Oct 21, 2010
    #1
    Hey, I'm not sure what I did to my main disk to screw it up, but now I can't install Snow Leopard and I get this error when trying to verify that disk. Thanks for any help!




    Verifying volume “disk3s3”
    ** /dev/disk3s3
    Invalid BS_jmpBoot in boot block: d8a8e1
    Error: Filesystem verify or repair failed.
    Verify and Repair volume “disk3s3”
    ** /dev/disk3s3
    Invalid BS_jmpBoot in boot block: d8a8e1
    Error: Filesystem verify or repair failed.
     
  2. wrldwzrd89 macrumors G5

    wrldwzrd89

    Joined:
    Jun 6, 2003
    Location:
    Solon, OH
    #2
    BS_jmpBoot, as far as I can tell, is a Boot Sector (BS) structure that tells the low-level firmware bits of the operating system where to jump to in order to load the operating system (or systems, if more than one is installed). If this gets corrupted, the computer will be unable to boot normally from the internal disk. Furthermore, Disk Utility cannot fix this error if it finds it, as you've discovered.
     
  3. raptorsoft2000 thread starter macrumors newbie

    Joined:
    Oct 21, 2010
    #3
    Could it be caused by my installing rEFIt?? http://refit.sourceforge.net/
    I installed that many years ago to dual boot windows which I really don't use and I'd like to get it off but don't know how!
     

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