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IMac Intel :: "Invalid Node Structure" - Disc Utility Can't Repair


My iMac 27" seems to have a hard drive problem. I have run disc utility and it says in red "Invalid node structure". Then it says, "Disc Utility can't repair this disc. Back up as many of your files as possible, reformat the disc, and restore your backed-up files". What are my options. I can't seem to get it to boot up without the original installation disc now.

Information:
iMac 27"
Mac OS X (10.6.4)


View 3 Replies (Posted: Nov 1, 2010)

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I have a 17inch intel iMac, early 2006 (the first release). A couple of days ago it decided it no longer wanted to boot up. Inserting the install DVD and running disk utilities verify/repair, it said that the volume had an invalid b-tree node size, and attempting to repair the volume failed.

Everything is backed up from this computer, so at this point in time I am only worried about getting it running again. So, I dug deeper to resolve the issue.

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There is wouldn't complete the boot. Froze at the apple logo or white screen with spinning mouse. Left that for several hours and stayed there. Tried repair and same issue. "ivalid node structure" redtating aftet that it just reboots and turns off a little bit after the chime. I have tried everything I could find on different forums without any success. I tried single user mode with the fsck commands and that failed also. I downloaded lion and made a recovery flash drive from another computer. I have since installed several new installations of lion after an erase and repartition. I took it to the apple store and they installed a fresh install of lion and it worked for a day then slowed down and froze. I would like to try everything possible before claiming the hardrive dead. I forgot to mention I have done PRAM resets in between the events I described as well as the SCM i think reset by unplugging. I have left it unplugged for over 12 hours, also have taken out all peripherals minus keyboard and mouse.

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iMac, Mac OS X (10.7.3)

Posted: Apr 10, 2012

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(These were the steps I took and nothing happened except another prompt informing me of an 'invalid node structure')

Boot off the OS X CD (reboot, hold C while booting).The installer will load up, go to Utilities in the menu and run Terminal.Type df and look for the drive that has your Mac system mounted---you'll have to unmount this. On my MacBook Pro, it was /dev/disk0s2.Type umount /dev/disk0s2, replacing disk0s2 with whatever disk your OS lives on.Type fsck_hfs -r /dev/disk0s2. If you umounted the wrong thing, it will complain that you can't repair a mounted drive. Go back and umount the right thing and repeat this step. 

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MacBook, Mac OS X (10.5.8)

Posted: Jun 22, 2012

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Mac OS X (10.5.4)

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Information:
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Information:
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Information:
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Information:
mac book pro
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Information:
iMac (Intel) and MBP
Mac OS X (10.6.3)

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Questions:

1) Can I repair using the First Aid utility (or is it more about getting a new HD)?

2) If so, can someone remind me what keys to press on startup to boot from the CD?

3) I have 10.5.8 right now. Can I still boot from the original Tiger installation CD and use that Disk Utility?

Information:
2.8 GHz Intel Core 2 Duo iMac
Mac OS X (10.5.8)
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Information:
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Information:
powermac g5
Mac OS X (10.5.2)

Posted: May 18, 2010

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