Startup partition dies in the middle of booting, Invalid node structure?

Hi! In the last few weeks, possibly since I last upgraded Lion and Safari, my iMac has been performing very badly. It's been sluggish, Safari and Finder repeatedly freezing and crashing/rebooting. Last night it escalated, and I launched Disk Utility to repair permissions. Ten hours later and no problems found. Not ten minutes later, the FInder crashes badly and I have to force a shutdown. When restarting, I get the grey progress bar, but it only reaches about 10%, then the hard drive whirrs and clicks a few times, and the computer shuts off. This happens every time I try to restart.
So instead, I boot into the recovery partition, and launch Disk Utility from there. Repair disk says the boot partition has an invalid node structure and I have to backup and reinstall. Now, I do have a Time Machine backup (a few days old since I don't have my Drobo on all the time due to the noise it makes), but since it's 800 GB of data I'm a bit reluctant to commit to that, hoping there is a simpler/faster solution. I'll see if I can try Disk Warrior. Or do you think I'd be better off to just nuke the entire drive and start from scratch?
The strange thing is that I have a Bootcamp partition with Windows 7, which works fine and actually can browse the files on the Lion partition. What does that mean? Can I use that to my advantage? If I do restore from Time Machine, will that affect my Bootcamp partition?

Disk Warrior confirmed that there were problems, but couldn't repair the node structure, possibly because of bad blocks. Support at the local Mac store (we don't have Apple stores here) said I should just try reinstalling the system, so that's what I did. It didn't work the first time, but then I reformatted the partition and since then everything has worked allright. I have now restored everything from the TM backup (which took about a day). I'm now guessing that the whirring was not actually some mechanical problem with the drive, but on the other hand DW wasn't too happy about the drive, so maybe I still have to replace it? I'm using it now and it seems better than before, but I won't do any serious work on this computer until I have a new TM backup in place.
(On that note, is it possible to "link" the restored system to the old TM backup that it was restored from? Or do I have to start over with a completely new TM backup, losing all the versioning of the old backup?)
UPDATE: Just ran Disk Utility, which now reported an erroneous block count in a file. Crossing my fingers hoping it's nothing critical adn that DU can repair it ...

Similar Messages

  • Problem when booting - Invalid Node Structure

    Hey!
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    After that the computer does not mount from hard drive (10.4 installed) anymore, only from cd. I tried booting in single user mode and executing /sbin/fsck -fy but I had the same result ("disk0s10: I/O error. Invalid node structure (4, 7698) **Volume check failed.").
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    Hi Ja!, and a warm welcome to the forums!
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    http://www.alsoft.com/DiskWarrior/
    If DW can't fix it, you might try Data Rescue II...
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    http://support.apple.com/kb/HT1430
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    If you are unable to repair the drive you will need to repartition and reformat the drive.
    I recommend a cloned backup to an external FW drive. You can use this procedure:
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    Executing fsck_hfs (version diskdev_cmds-491.0.2~7).
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    ** Checking catalog file
    ** Rebuilding catalog B-tree
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    disk0s2: I/O error.
    disk0s2: I/O error.
    disk0s2: I/O error.
    disk0s2: I/O error.
    disk0s2: I/O error.
    disk0s2: I/O error.
    disk0s2: I/O error.
    disk0s2: I/O error.
    disk0s2: I/O error.
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    Hmmm, yeah that could be the last option, but I can't format the disk right now, 'cause I've some extremely important (not-yet-backed-up) files in it
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