Re: External HD permissions
It has been years now since we needed to use the command line to create a mount point for USB devices before mounting the file system. Now we just plug them in and expect everything to be done for us automatically. In the old days we needed to use sudo commands to create the mount point first, and because of that the mount point was automatically owned by root until we chmodded it and/or chowned it. I'm not sure what's going on with Trusty, but maybe the developers are in the middle of making some changes to the way things work and for some reason it seems to be affecting the automatic mounting of USBs.
It's the mount point I would be looking at and chmodding, not stuff inside the drive itself.
Where: /media/don is your mount point for the file system you want access to.
sudo chmod 777 /media/don
The lost+found is a directory for the file system checker to put broken fragments of files in when you run a file system check after a hard shut-down or a crash, or if your hard drive is starting to fail.
Ubuntu user since 2004 (Warty Warthog)