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A possible fix for invalid sibling links on a hard drive
Authored by: grand2gz on Sep 30, '10 01:50:02PM

This actually worked for me (so far). I found the comments here helpful, in addition to the original post, so i thought I'd leave one of my own.

I have a G5 (dual) and powerbook G4 (both older machines) running OS X

I have no idea what exactly caused it, but last night, both machines crashed around the same time. When I rebooted I'd get a kernel panic within seconds of the desktop launch, time and again, on both machines!!

I ran fsck through single user mode and it said repairs were made, but the kernel panic aka "gray screen of death" kept coming back. I eventually got the laptop stable but not the G5. I found this post and decided to give it a try. I booted the G5 from the laptop (in target mode). I then used disk utility to unmount the main hard drive running my OS on the G5. I couldn't do it through terminal for some reason, but after unmounting in disk utility I could then go back into terminal and run fsck_hps -r on it. It made some repairs. I then ran fsck_hps -f (as suggested) and it confirmed said repairs. I went back to Disk Utility, ran verify disk and all seemed well. I repeated the process for every disk/partition on my desktop machine before rebooting. I'm back in business! Thanks to all for the help.

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