My internal system disk crashed and sos
disk detected an "invalid sibling link 4,5"
but was not able to repaired it.
So, I created a new install of OS 9 on
another part of the same disk, in order to
work.
But the old partition is still sick....

What does it mean, and what can I do ?

Thank you

To explain sibling links, first you need to
understand that most directory
information on Macintosh disks is stored
in data structures that are technically
known as B*-trees. Examples of B*-trees
on a Macintosh disk include the Catalog
File, the Extents Overflow File, the
Desktop Database, the Users & Groups
File, and several others.
Each tree has a number of data records;
for example, each record within the
Catalog tree describes one file or one
folder. The records are sorted and
indexed for fast searching. But for
efficiency, the records are also grouped
into fixed-length blocks called nodes;
because these nodes can be physically
scattered around the B*-tree file, they
need pointers to indicate their logical
ordering. So a given node has a "forward
link", which points to the node containing
records that are logically immediately
after the records in the current node;
likewise, a node has a "backward link",
pointing to the node containing logically
preceding records.
If these linkages are pointing to the wrong
place, some files or folders might be
inaccessible. Or the OS could even hang
up trying to find some. This makes the
link invalid.
In any case, Norton Disk Doctor reports
forward link and backward link problems
separately, whereas Disk First Aid just
refers to them collectively as sibling links.

Try DiskWarrior to build a new directory.
May fix the problem without having to
initialize the disk.

ah thanks guys for that info - I had the
exact same problem, invalid sibling link
error in disk first aid, and disk warrior
completely repaired the disk and saved
my @$$.

Hi, I have an invalid sibling lnk in OS X on
one of my partitions. Does anyone know
of a utility (*nix or Mac) that can fix this
while booted ito X?

My drive also came up with an invalid
sibling link. It's a laptop with only one
partition which is running 10.1.1. Classic
is not even installed.

Thanks.

I also got an invalid sibling link with my
powerbook running os 10.1.2. So the
partitian that has os 9 wont mount, and
disk utility wont repair it. I dont want to
have to reformat my drive again (fourth
time in two months), is there an os x
program that will fix the problem?

My sibling problem has an interesting
twist. The drive is an external firewire. It
mounts perfectly when I start from 9.2.2.
When I start up from 10.1.3, or if I'm in
10.1.3 and plug the drive in, I get the
following alert...

"A disk attempting to mount as unknown
has failed verification or has failed to
mount. Please use Disk utility to check
the disk and correct any errors.'"

So I launch Disk utility, check the disk,
and get the notice "Invalid Sibling Link"
and disk first aid won't fix it. But get this, if
I start in 9.2.2, the disk mounts, then I
change the startup disk and restart in
10.1.3 and it mounts fine. But I restart in
10.1.3 and I get the invalid sibling link.
Just thought I'd add that in case it might
help someone recover lost data. So,
obviously I think this problem is an OSX
bug.

Just had the exact same problem.. External firewire (LaCie 60 gig), OSX 10.1.3, worked once, then later gives me the same mount error.. Disk First Aid says "Invalid Sibling Link". Haven't tried it just under OS9, will do that, thanks. Hope this gets fixed soon.

Have the same "invalid sibling link" problem... but... OS9.1 on Powerbook3400/240. It's not letting my application programs open... listing them as "not found." Will take a look at Disk Warrior, but what results has anyone had with Norton Utilities? will check back. Thanks.