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I've set the /etc/fstab file so that I can mount an ext4 partition on startup and I did it with the following options : rw, auto, nouser, exec, sync.

The problem is that I can't create or delete any file on that partition without using sudo, which I find even more puzzling because I've mounted an ntfs partition (with these options : rw, auto, user, noexec, sync) and I didn't get the same problem I can read and write on the ntfs partition without using sudo.

How could I mount an ext4 partition and have read/write permissions on it?

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2 Answers

This is not because of mounting problem, but of permission. You may not have permission to write on drive/folders on it. As you not provided the mount point we assume partition mounted at /media/foo Open a terminal and run sudo chmod 777 /media/foo -R

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recursive 777 chmod is definitlely a very bad idea –  Kiwy Mar 25 at 10:33
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First of, it'd be useful to check the drive's UUID by using following command:
ls -l /dev/disk/by-uuid

In my experience, I usually mount an EXT4 formatted harddrive using the defaults, and I never experienced any errors in write permissions.

My /etc/fstab looks like the following:
UUID=004f9bfa-fb5a-438c-8a5a-dc04fa6f2d3e /media/MYCH0 auto defaults 0 0 #external hdd

if all fails, you also might try to set yourself as the owner by doing this:
sudo chown username:username /media/mountpoint

For further reference, you might want to take a look at this:
http://ubuntuforums.org/showthread.php?t=1482818

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Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference. –  FEichinger Feb 7 '13 at 13:52
    
@FEichinger Thanks for the heads up, I've edited my post. –  m.devrees Feb 7 '13 at 14:08
    
Wonderful. Please do include the source link, though, as it may have further information. In fact, try to always include the material you used to come to the answer. :) –  FEichinger Feb 7 '13 at 14:09
    
thanx, that did help –  Sameh Hany Feb 7 '13 at 15:30
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