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I have just saved some data from a crashed PC to my external HD, which is a HFS+ Volume using Ubuntu live (regular copy no dd). Now I am lost: I don't have any privileges in the Folder i copied on my Macbook. I tried changing it using chmod and chown, both as regular user and as root, but I always get a "operation not permitted". The owner for all those files is "999".

It worked to set it to ignore Ownership.

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Are these files locked (you can see this in Get Info dialog)? – Daniel Beck May 31 '11 at 10:59
    
They are not. I can't even click the locked checkbox. It's greyed out. – Benedikt Wutzi May 31 '11 at 11:00
    
Maybe try verifying/repairing in Disk Utility? Ignore ownership on the external drive and copy again? – Daniel Beck May 31 '11 at 11:10
    
I tried to repair permissions using diskutil but the option is greyed out. I can't copy the files again because the drive the came from crashed. – Benedikt Wutzi May 31 '11 at 11:14
    
Have you tried to set the volume to ignore ownership/permissions? – Daniel Beck May 31 '11 at 11:35

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