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Invalid Node Structure - Bad Hard Drive?

802 Views 1 Reply Latest reply: Nov 10, 2012 7:57 PM by Jeff RSS
squierjosh Level 1 Level 1 (10 points)
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Nov 9, 2012 8:26 PM

I just did a 3 hour format on my iMac G5 (zeroing out data). I think installed 10.5.6 from a retail install DVD. Everything went fine. Restarted, ran software update, and it downloaded and installed 10.5.8 and a couple other updates. Restarted, nothing happened. Just the Apple logo and the spinner. I booted from the DVD again and it gave me the invalid node structure notice, then unmounted the hard drive so I couldn't even see it. From some quick googling, it sounds like a file structure problem, but since it was after a low level format and a fresh install of the OS, is it more likely a hardware issue? I looked at the instructions for replacing the hard drive, and it's a bit overwhelming.

  • Jeff Level 6 Level 6 (11,160 points)
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    Nov 10, 2012 7:57 PM (in response to squierjosh)

    Before disassembling the iMac for hard drive replacement, you might want to purchase Alsoft's DiskWarrior.  Even before the introduction of OS X, it was always recommended for its superior "directory correction" capabilities.  It is possible that the original hard drive has an electronic and/or hardware problem that causes it to create data errors when writing to the disk.  You may find that after running DiskWarrior to clear up another problem, random directory errors persist.  If so, you can decide if you want to replace the drive.

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