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Possible Duplicate:
Changing file permissions on USB external hard drive

I have a funny thing happening with my USB devices. They are detected and show up as they should but I cannot write to them, I can read the files in them.

Read only

Cannot change option

I cannot change the Group folder access. It keeps reverting to none when I try change it.

However when I start a guest session and copy a screen shot to the USB I can, but cannot in my regular administration session. Why cannot I change the option and why does it behave properly in a guest session but not normally? Anyone know how to help me out here?

I am using Ubuntu 12.04, 32-bit.

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marked as duplicate by Nitin Venkatesh, izx, jokerdino, htorque, Mitch Aug 20 '12 at 7:11

This question was marked as an exact duplicate of an existing question.

I think this is a different issue. I seem to remember seeing this problem before, but I believe it is a distinct problem from the other. – RobotHumans Jul 5 '12 at 2:34
up vote 0 down vote accepted

Weird, I have what seems to be the same problem on my flash drive. Except I use the terminal commands [cp, rm, etc], and it says permission denied. However when I become root it works.

But for now, try this in a terminal:

$ gksu nautilus

Then try using that window to copy files. I believe you will find it does, because it's using root permissions. Be careful with that window, because you can remove system files, so I do not recommend using Nautilus as root normally, but in this case you might need to until you figure out how to fix the flash drive.

I am thinking about formatting my flash drive to see if it fixes the root-only permissions.

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This is not a purely USB stick problem. it is affecting my Kindle as well, I cannot add/remove from it with Calibre. – Dustin Jul 5 '12 at 14:05

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