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A possible fix for invalid sibling links on a hard drive
Authored by: chrisnwokc on Dec 29, '07 09:00:03AM
Got the same "invalid sibling link" error after Time Machine wouldn't backup to my external drive saying "disk is in read only mode". Went into Disk Utility, the "invalid sibling link" came up when trying to Verify Disk. Used Info in the Disk Utility to get Disk Identifier : disk1s1 (in my case). Then opened Terminal and ran:
chris$ fsck_hfs -r /dev/disk1s1
** /dev/rdisk1s1
** Checking Journaled HFS Plus volume.
** Checking Extents Overflow file.
** Checking Catalog file.
** Rebuilding Catalog B-tree.
** Rechecking volume.
** Checking Journaled HFS Plus volume.
** Checking Extents Overflow file.
** Checking Catalog file.
   Incorrect block count for file fseventsd-uuid
   (It should be 1 instead of 0)
   Incorrect number of thread records
(4, 31734)
** Checking multi-linked files.
** Checking Catalog hierarchy.
   Invalid directory item count
   (It should be 39 instead of 38)
   Invalid directory item count
   (It should be 37 instead of 36)
** Checking Extended Attributes file.
** Checking multi-linked directories.
** Checking volume bitmap.
   Volume Bit Map needs minor repair
** Checking volume information.
   Invalid volume free block count
   (It should be 77986023 instead of 77024057)
   Volume Header needs minor repair
(2, 0)
** Repairing volume.
** Rechecking volume.
** Checking Journaled HFS Plus volume.
** Checking Extents Overflow file.
** Checking Catalog file.
** Checking multi-linked files.
** Checking Catalog hierarchy.
** Checking Extended Attributes file.
** Checking multi-linked directories.
** Checking volume bitmap.
** Checking volume information.
** The volume Time Machine was repaired successfully.

Went back into Disk Utility and mounted the drive. Time Machine now works fine.

iMac Intel Core 2 Duo 2 GHz
Maxtor 500GB Firewire
Time Machine:
Capacity: 465.76 GB
Available: 297.49 GB
Writable: Yes
File System: Journaled HFS+
BSD Name: disk1s1
Mount Point: /Volumes/Time Machine

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A possible fix for invalid sibling links on a hard drive
Authored by: djb21au on Aug 07, '09 06:19:55PM

I just tried this hint (same problem - corrupted Time Machine external drive) but instead of a repaired time machine drive I got a 'segmentation fault'. Does anyone know what this means and how to repair it?

<code>....
** Checking volume bitmap.
Volume Bit Map needs minor repair
** Checking volume information.
Invalid volume file count
(It should be 48828 instead of 2)
Invalid volume directory count
(It should be 1746 instead of 2)
Invalid volume free block count
(It should be 163034431 instead of 244045199)
Volume Header needs minor repair
(2, 0)
** Repairing volume.
** Look for links to corrupt files in DamagedFiles directory.
Segmentation fault
</code>



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