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Invalid B-tree node size

Posted on 2013-01-10
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Last Modified: 2013-01-11
I have an external drive for my MAC that I can't seem to get to.  When I run a repair via Disk Utility I get the "Invalid B-tree node size" error.  And Volume Check Failed.

So disk untility isn't working.  I tried to run fsck_hfs -r /dev/disk1  but that's not working either.

Any idea how I can get this drive up??  I don't have DiskWarrior or TechTools handy.

Thanks,
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Question by:Rizznut
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8 Comments
 
LVL 53

Accepted Solution

by:
strung earned 230 total points
ID: 38765077
Depends on whether you need the data on it. If you don't, then simply reformat the drive.

If you need the data, recover it with DataRescue III ( http://www.prosofteng.com/products/data_rescue.php ) then reformat.
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Author Comment

by:Rizznut
ID: 38765673
I do need the data.  I found a copy of DiskWarrior 4.2, but it's too old for the Mac version of the drive.  Which I don't get since it's just an external drive.
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LVL 53

Expert Comment

by:strung
ID: 38765682
Your safest solution is to recover the data with DataRescue III and reformat.
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Author Comment

by:Rizznut
ID: 38765826
now it's not showing up on my Mac, nor on my Windows or Linux box.  I hear it spinning but it's not being recognized.  Did it just die??
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LVL 53

Expert Comment

by:strung
ID: 38766784
If the disk corruption is bad enough, it won't mount. DataRescue III will probably still recover the data if the disk still spins. The longer you play around with it, the worse the corruption will get and the less likely you will be able to recover anything.

If you value your data, get DataRescue III or something similar now.

DR III has a trial download that will list all the recoverable files and let you recover one file free of charge.
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Author Comment

by:Rizznut
ID: 38768153
Will it find the drive even if it's not mounting??  I can see it on my Linux box but it's telling me something about not having permission.  I can't seem to create a folder there either.  Can it be encrypted?  Does DR III recover from encrypted drives too??
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LVL 53

Expert Comment

by:strung
ID: 38768182
DR will find the drive even if it has not mounted.

Do you remember how the drive is formatted? If it is formatted FAT32, then you can try to recover data using Windows or Linux tools. If it was formatted in Mac format, using Windows or Linux tools might do further damage.

On the assumption it is Mac formatted, you should not do anything more before you try the trial version of DataRescue.
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Author Comment

by:Rizznut
ID: 38769414
It's formatted in HSF+.  Got DiskRescue 3 and it's working.  Thanks.
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