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I have created a file exchange permission that both OS X Lion and Ubuntu 12.04 can write to and read from. This partition is formatted as...

Apple_HFS Exchange  

...with journaling disabled. I have copied a folder from Ubuntu onto that partition. This folder appears as locked in OS X and I am not able to unlock this folder. The option is greyed out.

enter image description here enter image description here

The permission of this folder are:

drwxr-xr-x   4 1000      1000      136 11 Mai 14:43 Bilder
  • How can I unlock this file in OS X?
  • How can I prevent this from happening in the future?
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up vote 2 down vote accepted

Unlocking the file

You can unlock files from within the terminal using the chflags command with nouchg:

sudo chflags -R nouchg Bilder

According to the man page for chflags:

  • uchg is the user immutable flag
  • no in front of a flag removes the flag: nouchg

Preventing this from happening in the future

A general solution would probably be to avoid handling permission altogether and using NTFS or FAT for an exchange partition.

However, I specifically voided such a solution (FAT32) this time, because I encountered serious errors the last time.

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