Permisions to read and write on a external hard drive

Currently I am working with two Mac Air. One of them with Mac OS X 10.9.5 and the other one with Mac OS10.7.5.
Also I have most of my files in an external hard drive.
When I try to move file from the Mac air with Mac OS10.7.5 to the hard drive, I have no problem.
When I try to move file from the Mac air with Mac OS X 10.9.5 to the same hard drive, I am unable to do this action
because the hard drive appears as a read only (drwxr-xr-x)
Does any one knows how to change the settings to allow to write in the hard drive ( being able to save files from my
computer to the hard drive)
Thank you for your help.
by the way, the hard drive is not apple.

Dear Kappy
That's the problem. In the show information window doesn't appear any little lock anywhere as it appear in other windows
such as safety and privacy or in parenteral control.
Perhaps the lock to unlock this window is somewhere else in the preference settings.
I can try to see if with the Mac air with Mac OS10.7.5 I can change these settings,
but so far, I haven't being able to find a way to change permissions to read and write
through the information window.
Thank you for your collaboration
Ramon

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