How to : Fix a Locked Hard Disk

extracted from : http://forums.macosxhints.com/showthread.php?t=90894

 

First in terminal type :

 

ls -alO /Volumes

 

and hit return.  This will display the attached hard drives and give their permissions and owners.

 

drw-rw-r-T+   18   owner staff    uchg    680   May 28 08:56 HardDrive 

 

If your results include a  line like above with "uchg" then the following command should help:

 

chflags nouchg /Volumes/HardDrive

sudo chmod 1775 /Volumes/HardDrive

echo "done"

 

If the disk is owned by root then you can add a sudo into the first line also :

 

sudo chflags nouchg /Volumes/HardDrive

sudo chmod 1775 /Volumes/HardDrive

echo "done"