Need help with external hard drive!

Hi all,
I have been having trouble with my external hard drive.
My mac is reading the disk however all my files from the hard drive are missing?
In disk utility is seems to show that there are files on the disk but I cannot see them?
At the bottom is shows that there are files on the disk!
PLEASE HELP!!!!
Here is a screenshot of my disk utility

Ok just to clarify the format issue...
Just move the data from the external drive, format and then move it back if you want, as JiveMasterT explained.
If the external drive is FAT file system, then you don't need to format the drive unless you are planning on using the drive as an OSX backup.

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